Digital Commons Network^™

Dynamic Field Programmable Logic-Driven Soft Exosuit, Frances Cleary, Witawas Srisa-An, David C. Henshall, Sasitharan Balasubramaniam

School of Computing: Faculty Publications

The next generation of etextiles foresees an era of smart wearable garments where embedded seamless intelligence provides the ability to sense, process and perform. Core to this vision is embedded textile functionality enabling dynamic configuration. In this paper we detail a methodology, design and implementation of a dynamic field programmable logic-driven fabric soft exosuit. Dynamic field programmability allows the soft exosuit to alter its functionality and adapt to specific exercise programs depending on the wearers need. The dynamic field programmability is enabled through motion based control arm movements of the soft exosuit triggering momentary sensors embedded in the fabric exosuit …

Ethical Design Of Computers: From Semiconductors To Iot And Artificial Intelligence, Sudeep Pasricha, Marilyn Wolf

School of Computing: Faculty Publications

Computing systems are tightly integrated today into our professional, social, and private lives. An important consequence of this growing ubiquity of computing is that it can have significant ethical implications of which computing professionals should take account. In most real-world scenarios, it is not immediately obvious how particular technical choices during the design and use of computing systems could be viewed from an ethical perspective. This article provides a perspective on the ethical challenges within semiconductor chip design, IoT applications, and the increasing use of artificial intelligence in the design processes, tools, and hardware-software stacks of these systems.

Creative Connections: A Guidebook For Arts-Based Inquiry, Julia Marshall, Kimberley D'Adamo, Ann Ledo Lane

Kimberley D'Adamo: Art, Curriculum, Publications, and Other Scholarly Works

Art-based inquiry is an approach to art education that frames art making as a form of inquiry—a way of exploring and learning about ideas, ourselves and the world. The goals of art-based inquiry are understanding important topics, imagining possibilities, and inventing new realities. Students create art in order to meet those goals and they do it with a teacher’s guidance. For Creative Connections, art-based inquiry calls for a slight shift in perspective and change in practice. Adopting art-based inquiry does not mean throwing out everything you do. It means seeing art class diff erently and adapting it to a more …

Fgf Ligands And Receptors In Osteochondral Tissues Of The Temporomandibular Joint In Young And Aging Mice, Eliane H. Dutra, Po-Jung Chen, Zana Kalajzic, Sunil Wadhwa, Marja Hurley, Sumit Yadav

College of Dentistry: Faculty Publications

Objective. Fibroblast growth factors (FGFs) are a family of 22 proteins and 4 FGF receptors (FGFRs) that are crucial elements for normal development. The contribution of different FGFs and FGFRs for the homeostasis or disease of the cartilage from the mandibular condyle is unknown. Therefore, our goal was to characterize age-related alterations in the protein expression of FGF ligands and FGFRs in the mandibular condyle of mice. Method. Mandibular condyles of 1-, 6-, 12-, 18-, and 24-month-old C57BL/6J male mice (5 per group) were collected and histologically sectioned. Immunofluorescence for FGFs that have been reported to be relevant …

Joining A Conversation Research Project, Nicole Green, Deborah Minter

Department of English: Faculty Publications

Description: This unit is a culminating (end-of-semester) project designed to have students bring together the knowledge they have developed throughout the semester in the service of purposefully joining a real-world conversation, addressing a specific audience (or related set of audiences) who are part of that conversation. This unit has a small number of texts that the whole class reads and/or analyzes together. Instead, a lot of the work happening in this unit is project-driven and process-oriented.

Time Frame: This unit was designed/paced as the last unit of the course (and it followed an earlier unit focused on rhetorical analysis of …

Paradox As Resistance In Male Dominated Fields And The Value Of (Sur)Facing Enthymematic Narratives, Jennifer J. Mease (Also Peeksmease), Bronwyn Neal

Department of Communication Studies: Faculty Publications

Women working in masculine organizational contexts face a challenge of balancing (1) access to power by co-opting masculine discourse in ways that risk reinforcing it, with (2) challenging and resisting practices that privilege masculinity. In this manuscript, we address one communication strategy for navigating that challenge: The denial/acknowledgment paradox in which women explicitly deny that gender affected their experience, but also describe the many ways it affected their experience. To do so, we examined transcripts of interviews with 11 women candidates who ran in the 2017 Virginia House of Delegates election in the United States and demonstrated this paradoxical communication …

Difficult Conversations Concerning Identity And Difference: Diverse Approaches And Perspectives, Jordan Soliz, Srividya Ramasubramanian

Department of Communication Studies: Faculty Publications

This essay is an introduction to the special issue on “Difficult Conversations Concerning Identity and Difference.” The essay begins with our argument that inquiries into difficult conversations are important as these interactions are key to addressing social inequities, creating and/or maintaining community and relational solidarity, amplifying voices of marginalized populations and/or diverse experiences, and enacting social change. Following this, we introduce the articles in the special issue highlighting the theoretical frameworks and methodological pluralism across the various relational and social contexts represented in the research (e.g., health care, higher education, community organizations, personal relationships). To complement the implications discussed by …

Exploring The Impact Of Pediatric Short Bowel Syndrome On Parent Well‐Being Using A Disease‐Specific Pilot Survey, Marie L. Neumann, Jessica Y. Allen, Amy Ladner, Swapna Kakani, Meaghann S. Weaver, David F. Mercer

Department of Communication Studies: Faculty Publications

Background: Children with short bowel syndrome (SBS) have complex care needs, most of which are met in the home by family caregivers who may experience a range of stressors unique to this experience. Prior research suggests that parents of children with SBS have poorer health‐related quality of life than peers parenting children without health needs, but the mechanisms shaping parent outcomes are understudied.

Methods: A pilot survey was developed using a community‐driven research design to measure the impact of disease‐specific items on parent‐perceived well‐being. The cross‐sectional survey, which included both closed‐ended and open‐ended items, was distributed to a …

Advocating For A Patient‐ And Family Centered Care Approach To Management Of Short Bowel Syndrome, Vanessa J. Kumpf, Marie L. Neumann, Swapna R. Kakani

Department of Communication Studies: Faculty Publications

Patient‐ and family centered care (PFCC) is a model of providing healthcare that incorporates the preferences, needs, and values of the patient and their family and is built on a solid partnership between the healthcare team and patient/family. This partnership is critical in short bowel syndrome (SBS) management since the condition is rare, chronic, involves a heterogenous population, and calls for a personalized approach to care. Institutions can facilitate the practice of PFCC by supporting a teamwork approach to care, which, in the case of SBS, ideally involves a comprehensive intestinal rehabilitation program consisting of qualified healthcare practitioners who are …

Characterization Of Western Corn Rootworm (Coleoptera: Chrysomelidae) Susceptibility To Foliar Insecticides In Northeast Nebraska, Timothy B. Dang, Ana M. Vélez, Arnubio Valencia-Jiménez, Jordan Reinders, Emily E. Stricklin, Matthew W. Carroll, Clinton D. Pilcher, Jeffrey T. Krumm, Graham P. Head, Lance Meinke

Department of Entomology: Faculty Publications

Foliar-applied insecticides are commonly used for adult Western Corn Rootworm (WCR), Diabrotica virgifera virgifera LeConte (Coleoptera: Chrysomelidae), control in Nebraska but little efficacy data is available. Anecdotal reports of reduced efficacy in areas of northeast Nebraska led to the conduct of this study. Objectives were to (i) evaluate the efficacy of commercial applications of commonly used formulated insecticides (bifenthrin, lambda-cyhalothrin, chlorpyrifos, or tank mixes) for WCR control in 7 northeast Nebraska counties during 2019 and 2020 and (ii) conduct adult WCR concentration-response vial bioassays with bifenthrin, chlorpyrifos, and dimethoate active ingredients on a subset of field populations. Whole plant counts …

Insect And Pest Management For Sustaining Crop Production Under Changing Climatic Patterns Of Drylands, Ruchika Kashyap, Sajjan Grover, Heena Puri, Sandeep Kaur, Jagmohan Singh, Karansher S. Sandhu, Gagandeep Kaur, Hinal Kharva, Shivreet Kaur, Balwinder Kaur

Department of Entomology: Faculty Publications

Climate change is alarming, particularly for agriculturists as it severely impacts the development, distribution, and survival of insects and pests, affecting crop production globally. Over time, climate change is drastically tumbling the crop productivity in all the cropping systems, whereas the dryland agriculture with existing low productivity is immensely hit. While all the existing species in drylands, including humans, are coping with extreme climate variations for millennia, future climate change predictions put dryland agriculture in a threat zone. Drylands support 38% of the world’s population; therefore, climate change coupled with population growth and global food security draws the attention of …

Sexuality Training In Counseling Psychology: A Mixed-Methods Study Of Student Perspectives, Dena Abbott, Jacob E. Vargas, Hali J. Santiago

Department of Educational Psychology: Faculty Publications

Counseling psychologists are a cogent fit to lead the movement toward a sex-positive professional psychology (Burnes et al., 2017a). Though centralizing training in human sexuality (HS; Mollen & Abbott, 2021) and sexual and reproductive health (Grzanka & Frantell, 2017) is congruent with counseling psychologists’ values, training programs rarely require or integrate comprehensive sexuality training for their students (Mollen et al., 2020). We employed a critical mixed-methods design in the interest of centering the missing voices of doctoral-level graduate students in counseling psychology in the discussion of the importance of human sexuality competence for counseling psychologists. Using focus groups to ascertain …

The Us In Uterus: A Collaborative Autoethnography Of Psychologists Advocating For Reproductive Justice, Dena Abbott, Rin Nguyen, Carrie Bohmer, Millie L. Myers, Jessica A. Boyles, Caitlin M. Mercier

Department of Educational Psychology: Faculty Publications

In light of the recent Supreme Court decision to overturn Roe v. Wade, millions of people with uteruses have been forced to navigate precarious access to reproductive care. Although health service psychologists have an ethical responsibility to engage in reproductive justice advocacy, training programs often do not adequately address sexual and reproductive health. Therefore, we sought to better understand how health service psychologists’ personal and professional experiences influence each other and explore the ways in which we as reproductive beings and advocates sustain ourselves amidst tremendous sociopolitical uncertainty. In order to do so, we employed a feminist collaborative autoethnography approach …

Enhancing Nonverbal Communication Through Virtual Human Technology: Protocol For A Mixed Methods Study, Analay Perez, Michael D. Fetters, John W. Creswell, Mark Scerbo, Frederick W. Kron, Richard Gonzalez, Lawrence An, Masahito Jimbo, Predrag Klasnja, Timothy C. Guetterman

Department of Educational Psychology: Faculty Publications

Background: Communication is a critical component of the patient-provider relationship; however, limited research exists on the role of nonverbal communication. Virtual human training is an informatics-based educational strategy that offers various benefits in communication skill training directed at providers. Recent informatics-based interventions aimed at improving communication have mainly focused on verbal communication, yet research is needed to better understand how virtual humans can improve verbal and nonverbal communication and further elucidate the patient-provider dyad.

Objective: The purpose of this study is to enhance a conceptual model that incorporates technology to examine verbal and nonverbal components of communication and develop a …

Indigenous Cultural Identity Protects Against Intergenerational Transmission Of Aces Among Indigenous Caregivers And Their Children, Katie Edwards, Emily A. Waterman, Natira Mullet, Ramona Herrington, Sloane Cornelius, Skyler Hopfauf, Preciouse Trujillo, Lorey A. Wheeler, Arielle R. Deutsch

Department of Educational Psychology: Faculty Publications

A large body of empirical research has demonstrated that caregiver adverse childhood experiences (ACEs) predict ACEs in one’s child, a phenomenon known as the intergenerational transmission of ACEs. Little of this empirical research, however, has focused specifically on Indigenous peoples despite a growing body of theoretical literature and the wisdom of Elders and Traditional Knowledge Keepers that speaks to the presence of this phenomenon within Indigenous communities as well as the protective role of Indigenous cultural identity in preventing the intergenerational transmission of ACEs. The purpose of the current study was to conduct an empirical evaluation of this hypothesis, specifically …

The Illustrated Ivan: Ivan Iv In The Illustrated Chronicle Compilation, Charles J. Halperin, Ann M. Kleimola

Russian Language and Literature Papers

The surviving segments of the incomplete Illustrated Chronicle Compilation (LLS), in both text and miniatures, present a consistently positive image of Ivan IV as pious, just and competent, although the portrayal of individual events could vary. Nevertheless they also sometimes portray him as not in control of his elite, his subjects or events. If Ivan had to restore order by punishing those who had acted unjustly without his permission, then he had obviously failed to prevent such misdeeds. The miniatures in LLS present a cohesive image of the Public Ivan, despite the various stages of completion of individual segments, efforts …

Early-Phase Drive To The Precursor Pool: Chloroviruses Dive Into The Deep End Of Nucleotide Metabolism, David Dunigan, Irina Agarkova, Ahmed Esmael, Sophie Alvarez, James L. Van Etten

Nebraska Center for Virology: Faculty Publications

Viruses face many challenges on their road to successful replication, and they meet those challenges by reprogramming the intracellular environment. Two major issues challenging Paramecium bursaria chlorella virus 1 (PBCV-1, genus Chlorovirus, family Phycodnaviridae) at the level of DNA replication are (i) the host cell has a DNA G+C content of 66%, while the virus is 40%; and (ii) the initial quantity of DNA in the haploid host cell is approximately 50 fg, yet the virus will make approximately 350 fg of DNA within hours of infection to produce approximately 1000 virions per cell. Thus, the quality and quantity of …

The Persistence And Stabilization Of Auxiliary Genes In The Human Skin Virome, Ema H. Graham, Wesley A. Tom, Alison C. Neujahr, Michael Adamowicz, Jennifer Clarke, Joshua R. Herr, Samodha C. Fernando

Nebraska Center for Virology: Faculty Publications

Background The human skin contains a diverse microbiome that provides protective functions against environmental pathogens. Studies have demonstrated that bacteriophages modulate bacterial community composition and facilitate the transfer of host-specific genes, potentially influencing host cellular functions. However, little is known about the human skin virome and its role in human health. Especially, how viral-host relationships influence skin microbiome structure and function is poorly understood.

Results Population dynamics and genetic diversity of bacteriophage communities in viral metagenomic data collected from three anatomical skin locations from 60 subjects at five different time points revealed that cutaneous bacteriophage populations are mainly composed of …

Gender-Based Impacts Of Covid-19 In Sub- Saharan Africa, Helen Onyeaka, Phemelo Tamasiga, Ifeanyi Michael Mazi, Hope Akegbe, John K. Osiri

Department of Management: Faculty Publications

The lasting educational and economic impacts of COVID-19 have disproportionally disadvantaged girls on the fringes of society, extending beyond the period of imposed lockdowns. This study delves deeper into the education, socio-economic, and gender-specific effects of the COVID-19 pandemic within the context of Sub-Saharan Africa (SSA). The research illuminates how the pandemic has influenced economic activities and the roles of teachers, parents, and students in the educational process. Furthermore, the paper examines the efficacy of distance learning across diverse media in SSA. The findings suggest that children from rural settings might have limited resources to adapt and continue their education …

Elections And Post Traumatic Stress: Evidence From The 2020 U.S. Presidential Election, Timothy Fraser, Costas Panagopoulos, Kevin Smith

Department of Political Science: Faculty Publications

The 2020 U.S. presidential election saw rising political tensions among ordinary voters and political elites, with fears of election violence culminating in the January 6th riot. We hypothesized that the 2020 election might have been traumatic for some voters, producing measurable symptoms of post-traumatic stress disorder (PTSD). We also hypothesized that negative sentiment towards the opposing party correlates with PTSD. We measured PTSD with a modified PCL-5, a validated PTSD screener, for 573 individuals from a nationally representative YouGov sample. We modeled the association between affective polarization and PTSD, controlling for political, demographic, and psychological traits. We estimate that 12.5% …

Mites [Of Dogs And Cats], Susan E. Little, Roberto Cortinas

School of Veterinary and Biomedical Sciences: Faculty Publications

Veterinary parasitology: 20,000-word article details recognition and treatments for mite infestations of dogs and cats. Mite species reviewed include:

Cheyletiella spp. (“Walking Dandruff”)

Demodex spp. (Hair Follicle Mites, Red Mange, Demodicosis, Demodectic Mange)

Sarcoptes scabiei (Itch Mite, Scabies, Sarcoptic Mange)

Notoedres cati (Feline Head and Neck Mange)

Otodectes cynotis (Ear Mites)

Pneumonyssoides caninum (Nasal Mite)

Lynxacarus radovskyi (Fur Mite, Hair Clasping Mite)

Trombiculid Mites (Chiggers, Red Bugs, Berry Bugs, Harvest Mites, Scrub Itch or Grass Itch Mites)

Discussions include Etiology and epidemiology, Pathogenesis, Clinical features, Diagnosis, Treatment and prognosis, Immunity, Prevention, and Public health aspects.

Complete with 209 references.

More People, More Cats, More Parasites: Human Population Density And Temperature Variation Predict Prevalence Of Toxoplasma Gondii Oocyst Shedding In Free-Ranging Domestic And Wild Felids, Sophie Zhu, Elizabeth Vanwormer, Karen Shapiro

School of Veterinary and Biomedical Sciences: Faculty Publications

Toxoplasma gondii is a ubiquitous zoonotic parasite that can infect warm-blooded vertebrates, including humans. Felids, the definitive hosts, drive T. gondii infections by shedding the environmentally resistant stage of the parasite (oocysts) in their feces. Few studies characterize the role of climate and anthropogenic factors in oocyst shedding among free-ranging felids, which are responsible for the majority of environmental contamination. We determined how climate and anthropogenic factors influence oocyst shedding in free-ranging domestic cats and wild felids using generalized linear mixed models. T. gondii oocyst shedding data from 47 studies were systematically reviewed and compiled for domestic cats and six …

Chemical Characterization And Biological Evaluation Of Epilobium Parviflorum Extracts In An In Vitro Model Of Human Malignant Melanoma, Sotiris Kyriakou, Venetia Tragkola, Ioannis Paraskevaidis, Mihalis Plioukas, Dimitrios T. Trafalis, Rodrigo Franco, Aglaia Pappa, Mihalis I. Panayiotidi

School of Veterinary and Biomedical Sciences: Faculty Publications

Malignant melanoma is an aggressive type of skin cancer characterised by high metastatic capacity and mortality rate. On the other hand, Epilobium parviflorum is known for its medicinal properties, including its anticancer potency. In this context, we aimed to (i) isolate various extracts of E. parviflorum, (ii) characterize their phytochemical content, and (iii) determine their cytotoxic potential in an in vitro model of human malignant melanoma. To these ends, we utilized various spectrophotometric and chromatographic (UPLC-MS/MS) approaches to document the higher content of the methanolic extract in polyphenols, soluble sugars, proteins, condensed tannins, and chlorophylls -a and -b as …

Does Swab Type Matter? Comparing Methods For Mannheimia Haemolytica Recovery And Upper Respiratory Microbiome Characterization In Feedlot Cattle, William B. Crosby, Lee Pinnell, John T. Richeson, Cory Wolfe, Jake Castle, John Dustin Loy, Sheryl P. Gow, Keun Seok Seo, Sarah F. Capik, Amelia R. Woolums, Paul S. Morley

School of Veterinary and Biomedical Sciences: Faculty Publications

Background: Bovine respiratory disease (BRD) is caused by interactions among host, environment, and pathogens. One standard method for antemortem pathogen identification in cattle with BRD is deep-guarded nasopharyngeal swabbing, which is challenging, costly, and waste generating. The objective was to compare the ability to recover Mannheimia haemolytica and compare microbial community structure using 29.5 inch (74.9 cm) deep-guarded nasopharyngeal swabs, 16 inch (40.6 cm) unguarded proctology swabs, or 6 inch (15.2 cm) unguarded nasal swabs when characterized using culture, real time-qPCR, and 16S rRNA gene sequencing. Samples for aerobic culture, qPCR, and 16S rRNA gene sequencing were collected from the …

Detection Of Mannheimia Haemolytica-Specific Igg, Igm And Iga In Sera And Their Relationship To Respiratory Disease In Cattle, Korakrit Poonsuk, Carita Kordik, Matthew M. Hille, Ting-Yu Cheng, William B. Crosby, Amelia R. Woolums, Michael L. Clawson, Carol G. Chitko-Mckown, Bruce Brodersen, John Dustin Loy

School of Veterinary and Biomedical Sciences: Faculty Publications

Mannheimia haemolytica is one of the major causes of bovine respiratory disease in cattle. The organism is the primary bacterium isolated from calves and young cattle affected with enzootic pneumonia. Novel indirect ELISAs were developed and evaluated to enable quantification of antibody responses to whole cell antigens using M. haemolytica A1 strain P1148. In this study, the ELISAs were initially developed using sera from both M. haemolytica-culture-free and clinically infected cattle, then the final prototypes were tested in the validation phase using a larger set of known-status M. haemolytica sera (n = 145) collected from feedlot cattle. The test …

First Gene-Edited Calf With Reduced Susceptibility To A Major Viral Pathogen, Aspen M. Workman, Michael P. Heaton, Brian L. Vander Ley, Dennis A. Webster, Luke Sherry, Jonathan R. Bostrom, Sabrina Larson, Theodore S. Kalbfleisch, Gregory P. Harhay, Erin E. Jobman, Daniel F. Carlson, Tad S. Sonstegard

School of Veterinary and Biomedical Sciences: Faculty Publications

Bovine viral diarrhea virus (BVDV) is one of the most important viruses affecting the health and well-being of bovine species throughout the world. Here, we used CRISPR-mediated homology-directed repair and somatic cell nuclear transfer to produce a live calf with a six amino acid substitution in the BVDV binding domain of bovine CD46. The result was a gene-edited calf with dramatically reduced susceptibility to infection as measured by reduced clinical signs and the lack of viral infection in white blood cells. The edited calf has no off-target edits and appears normal and healthy at 20 months of age without obvious …

Aerobic Exercise And Scaffolds With Hierarchical Porosity Synergistically Promote Functional Recovery Post Volumetric Muscle Loss, Christina Zhu, Karina Skylar, Yori Endo, Mohamadmahdi Samandari,, Mehran Karvar, Azadeh Mostafavi, Jacob Quint, Chiara Rioldi, Wojciech Swieszkowski, Joshua Mauney, Shailesh Agarwal, Ali Tamayol, Indranil Sinha

School of Veterinary and Biomedical Sciences: Faculty Publications

Volumetric muscle loss (VML) is a composite loss of skeletal muscle tissue (greater than 20%) that heals with minimal muscle regeneration, substantial fibrosis, and subsequent functional deficits. Standard treatment, involving free functional muscle transfer and physical therapy, cannot restore full muscle function following VML. Tissue engineered scaffolds, 3D structural templates that mimic native extracellular matrix, are promising to enhance functional muscle formation and recovery. Bioprinted 3D scaffolds are engineered using bioinks, created from scaffolding material, cells, and growth factors, to replicate skeletal muscle architecture with precise control over their spatial deposition. METHODS: The present study evaluates a 3D-printed foam-like scaffold …

Host-Genetic-Based Outcome Of Co-Infection By Pcv2b And Prrsv In Pigs, Christian W. Eaton, Hiep Vu, Arabella L. Hodges, Seth P. Harris, Stephen D. Kachman, Daniel C. Ciobanu

School of Veterinary and Biomedical Sciences: Faculty Publications

Replication of porcine circovirus type 2 (PCV2), an important worldwide swine pathogen, has been demonstrated to be influenced by host genotype. Specifically, a missense DNA polymorphism (SYNGR2 p.Arg63Cys) within the SYNGR2 gene was demonstrated to contribute to variation in PCV2b viral load and subsequent immune response following infection. PCV2 is known to induce immunosuppression leading to an increase in susceptibility to subsequent infections with other viral pathogens such as porcine reproductive and respiratory syndrome virus (PRRSV). In order to assess the role of SYNGR2 p.Arg63Cys in co-infections, pigs homozygous for the favorable SYNGR2 p.63Cys (N = 30) …

Infection Of Feral Phenotype Swine With Japanese Encephalitis Virus, So Lee Park, Yan-Jang S. Huang, Amy C. Lyons, Victoria B. Ayers, Susan M. Hettenbach, D. Scott Mcvey, Leela E. Noronha, Kenneth R. Burton, Stephen Higgs, Dana L. Vanlandingham

School of Veterinary and Biomedical Sciences: Faculty Publications

Background: Japanese encephalitis virus (JEV) is a mosquito-borne zoonotic flavivirus and the leading cause of pediatric encephalitis in the Asian Pacific region. The transmission cycle primarily involves Culex spp. mosquitoes and Ardeid birds, with domestic pigs (Sus scrofa domestica) being the source of infectious viruses for the spillover of JEV from the natural endemic transmission cycle into the human population. Although many studies have concluded that domestic pigs play an important role in the transmission cycle of JEV, and infection of humans, the role of feral pigs in the transmission of JEV remains unclear. Since domestic and …

Femtosecond Electronic And Hydrogen Structural Dynamics In Ammonia Imaged With Ultrafast Electron Diffraction, Elio G. Champenois, Nanna H. List, Matthew Ware, Mathew Britton, Philip H. Bucksbaum, Xinxin Cheng, Martin Centurion, James P. Cryan, Ruaridh Forbes, Ian Gabalski, Kareem Hegazy, Matthias C. Hoffmann, Andrew J. Howard, Fuhao Ji, Ming-Fu Lin, J. Pedro F. Nunes, Xiaozhe Shen, Jie Yang, Xijie Wang, Todd J. Martinez, Thomas J. A. Wolf

Department of Physics and Astronomy: Faculty Publications

Directly imaging structural dynamics involving hydrogen atoms by ultrafast diffraction methods is complicated by their low scattering cross sections. Here we demonstrate that megaelectronvolt ultrafast electron diffraction is sufficiently sensitive to follow hydrogen dynamics in isolated molecules. In a study of the photodissociation of gas phase ammonia, we simultaneously observe signatures of the nuclear and corresponding electronic structure changes resulting from the dissociation dynamics in the time-dependent diffraction. Both assignments are confirmed by ab initio simulations of the photochemical dynamics and the resulting diffraction observable. While the temporal resolution of the experiment is insufficient to resolve the dissociation in time, …