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Articles 1 - 23 of 23
Full-Text Articles in Atomic, Molecular and Optical Physics
A Combined Theoretical And Photoelectron Spectroscopy Study Of Al3hn- (N=1-9) Clusters, Jing Xu, Xinxing Zhang, Haopeng Wang, Lijuan Fu, Xiang Li, Andrej Grubisic, Rachel M. Harris, Bryan Eichhorn, Gerd Gantefoer, Yihong Ding, Boggavarapu Kiran, Anil K. Kandalam, Kit H. Bowen
A Combined Theoretical And Photoelectron Spectroscopy Study Of Al3hn- (N=1-9) Clusters, Jing Xu, Xinxing Zhang, Haopeng Wang, Lijuan Fu, Xiang Li, Andrej Grubisic, Rachel M. Harris, Bryan Eichhorn, Gerd Gantefoer, Yihong Ding, Boggavarapu Kiran, Anil K. Kandalam, Kit H. Bowen
Physics & Engineering Faculty Publications
Combined photoelectron spectroscopic experiments and computational studies have been performed on Al3Hn- (n=1-9) clusters. Three modes of hydrogen bonding to the Al-3 moiety have been observed: terminal, bridging, and capping. Among various hydrides, Al3H5- and Al3H8- clusters have highest HOMO-LUMO gap and largest electron affinity, respectively. Our studies indicate that as the number of hydrogen atoms increase the presence of AlH2 groups, representing the tetrahedral coordination of the Al atom, which in turn led to the stoichiometric ring structure.
Picosecond Time-Resolved Dynamics Of Energy Transfer Between Gan And The Various Excited States Of Eu3+ Ions, Ruoqiao Wei, Brandon Mitchell, Dolf Timmerman, Tom Gregorkiewicz, Wanxin Zhu, Jun Tatebayashi, Shuhei Ichikawa, Yasufumi Fujiwara, Volkmar Dierolf
Picosecond Time-Resolved Dynamics Of Energy Transfer Between Gan And The Various Excited States Of Eu3+ Ions, Ruoqiao Wei, Brandon Mitchell, Dolf Timmerman, Tom Gregorkiewicz, Wanxin Zhu, Jun Tatebayashi, Shuhei Ichikawa, Yasufumi Fujiwara, Volkmar Dierolf
Physics & Engineering Faculty Publications
To elucidate the energy transfer and reexcitation processes in Eu-doped GaN layers that are used in recently developed, highly efficient red light-emitting diodes, a systematic series of photoluminescence and time-resolved photoluminescence (TR-PL) measurements was performed. Critical insights on how “slow” Eu processes (∼µs) can compete against fast semiconductor processes (∼ps) are revealed using TR-PL with a high temporal resolution, as it is found that the initial energy transfer from GaN to the Eu3+ ions takes place rapidly, on a timescale of <100 ps. Below band-gap resonant excitation was used to identify the states into which the energy transfer occurs. For the most efficient Eu defect complexes, this transfer dominantly occurs directly into the 5 D0 state of Eu3+. Less efficient complexes also exhibit transfer into the 5 D2 state, the emission of which can be detected using photoluminescence at low temperature, indicating the importance of the excitation pathway on device efficiency. Under high excitation intensity, reexcitation can also occur, leading to a redistribution of population into the 5 D2, 5 D1, or 5 D0 states.
Charge State Of Vacancy Defects In Eu-Doped Gan, Brandon Mitchell, N. Hernandez, D. Lee, A. Koizumi, Y. Fujiwara, V. Dierolf
Charge State Of Vacancy Defects In Eu-Doped Gan, Brandon Mitchell, N. Hernandez, D. Lee, A. Koizumi, Y. Fujiwara, V. Dierolf
Physics & Engineering Faculty Publications
Eu ions have been doped into GaN in order to achieve red luminescence under current injection, where coupling between the Eu ions and intrinsic defects such as vacancies are known to play an important role. However, the charge state of the vacancies and the impact it would have on the optical and magnetic properties of the Eu ions have not been explored. Through a combination of first-principle calculations and experimental results, the influence of the charge state of the defect environment surrounding the Eu ions has been investigated. We have identified two Eu centers that are related through the charge …
Enhancement Of Hopping Conductivity By Spontaneous Fractal Ordering Of Low-Energy Sites, Tianran Chen, Brian Skinner
Enhancement Of Hopping Conductivity By Spontaneous Fractal Ordering Of Low-Energy Sites, Tianran Chen, Brian Skinner
Physics & Engineering Faculty Publications
Variable-range hopping conductivity has long been understood in terms of a canonical prescription for relating the single-particle density of states to the temperature-dependent conductivity. Here we demonstrate that this prescription breaks down in situations where a large and long-ranged random potential develops. In particular, we examine a canonical model of a completely compensated semiconductor, and we show that at low temperatures hopping proceeds along self-organized, low-dimensional subspaces having fractal dimension d = 2. We derive and study numerically the spatial structure of these subspaces, as well as the conductivity and density of states that result from them. One of our …
Photoelectron Spectroscopy Of Boron Aluminum Hydride Cluster Anions, Haopeng Wang, Xinxing Zhang, Yeon Je Ko, Gerd Gantefoer, Kit H. Bowen, Xiang Li, Boggavarapu Kiran, Anil K. Kandalam
Photoelectron Spectroscopy Of Boron Aluminum Hydride Cluster Anions, Haopeng Wang, Xinxing Zhang, Yeon Je Ko, Gerd Gantefoer, Kit H. Bowen, Xiang Li, Boggavarapu Kiran, Anil K. Kandalam
Physics & Engineering Faculty Publications
No abstract provided.
The Viability Of Aluminum Zintl Anion Moieties Within Magnesium-Aluminum Clusters, Haopeng Wang, Yeon Jae Ko, Xinxing Zhang, Gerd Gantefoer, Hansgeorg Schnoeckel, Bryan W. Eichhorn, Puru Jena, Boggavarapu Kiran, Anil K. Kandalam, Kit H. Bowen Jr.
The Viability Of Aluminum Zintl Anion Moieties Within Magnesium-Aluminum Clusters, Haopeng Wang, Yeon Jae Ko, Xinxing Zhang, Gerd Gantefoer, Hansgeorg Schnoeckel, Bryan W. Eichhorn, Puru Jena, Boggavarapu Kiran, Anil K. Kandalam, Kit H. Bowen Jr.
Physics & Engineering Faculty Publications
No abstract provided.
Aluminum Zintl Anion Moieties Within Sodium Aluminum Clusters, Haopeng Wang, Xinxing Zhang, Yeon Jae Ko, Andrej Grubisic, Xiang Li, Gerd Ganteför, Hansgeorg Schnöckel, Bryan W. Eichhorn, Mal-Soon Lee, Puru Jena, Anil K. Kandalam, Boggavarapu Kiran, Kit H. Bowen
Aluminum Zintl Anion Moieties Within Sodium Aluminum Clusters, Haopeng Wang, Xinxing Zhang, Yeon Jae Ko, Andrej Grubisic, Xiang Li, Gerd Ganteför, Hansgeorg Schnöckel, Bryan W. Eichhorn, Mal-Soon Lee, Puru Jena, Anil K. Kandalam, Boggavarapu Kiran, Kit H. Bowen
Physics & Engineering Faculty Publications
No abstract provided.
Electron Tunneling Characteristics Of A Cubic Quantum Dot, (Pbs)32, Sanjeev K. Gupta, Haiying He, Douglas Banyai, Anil K. Kandalam, Ravindra Pandey
Electron Tunneling Characteristics Of A Cubic Quantum Dot, (Pbs)32, Sanjeev K. Gupta, Haiying He, Douglas Banyai, Anil K. Kandalam, Ravindra Pandey
Physics & Engineering Faculty Publications
No abstract provided.
Al6h18: A Baby Crystal Of Γ -Alh3, B. Kiran, Anil K. Kandalam, Jing Xu, Y. H. Ding, M. Sierka, K. H. Bowen, H. Schnöckel
Al6h18: A Baby Crystal Of Γ -Alh3, B. Kiran, Anil K. Kandalam, Jing Xu, Y. H. Ding, M. Sierka, K. H. Bowen, H. Schnöckel
Physics & Engineering Faculty Publications
No abstract provided.
(Pbs)32: A Baby Crystal, B. Kiran, Anil K. Kandalam, Rameshu Rallabandi, Pratik Koirala, Xiang Li, Xin Tang, Yi Wang, Howard Fairbrother, Gerd Gantefoer, Kit Bowen
(Pbs)32: A Baby Crystal, B. Kiran, Anil K. Kandalam, Rameshu Rallabandi, Pratik Koirala, Xiang Li, Xin Tang, Yi Wang, Howard Fairbrother, Gerd Gantefoer, Kit Bowen
Physics & Engineering Faculty Publications
No abstract provided.
Superhalogen Properties Of Cumcln Clusters: Theory And Experiment, Y. J. Ko, H. Wang, K. Pradhan, P. Koirala, Anil K. Kandalam, K. H. Bowen, P. Jena
Superhalogen Properties Of Cumcln Clusters: Theory And Experiment, Y. J. Ko, H. Wang, K. Pradhan, P. Koirala, Anil K. Kandalam, K. H. Bowen, P. Jena
Physics & Engineering Faculty Publications
No abstract provided.
Photoelectron Spectroscopic Study Of Iron-Pyrene Cluster Anions, Xiang Li, Kit H. Bowen Jr., Puru Jena, Anil K. Kandalam
Photoelectron Spectroscopic Study Of Iron-Pyrene Cluster Anions, Xiang Li, Kit H. Bowen Jr., Puru Jena, Anil K. Kandalam
Physics & Engineering Faculty Publications
No abstract provided.
Structural Evolution And Stabilities Of Neutral And Anionic Clusters Of Lead Sulfide: Joint Anion Photoelectron And Computational Studies, Pratik Koirala, Boggavarapu Kiran, Anil K. Kandalam, Charles A. Fancher, Helen L. De Clercq, Xiang Li, Kit H. Bowen
Structural Evolution And Stabilities Of Neutral And Anionic Clusters Of Lead Sulfide: Joint Anion Photoelectron And Computational Studies, Pratik Koirala, Boggavarapu Kiran, Anil K. Kandalam, Charles A. Fancher, Helen L. De Clercq, Xiang Li, Kit H. Bowen
Physics & Engineering Faculty Publications
No abstract provided.
Structures And Photoelectron Spectroscopy Of Cun(Bo2)M− (N, M = 1, 2) Clusters: Observation Of Hyperhalogen Behavior, Yuan Feng, Hong-Guang Xu, Weijun Zheng, Hongmin Zhao, Anil K. Kandalam, Puru Jena
Structures And Photoelectron Spectroscopy Of Cun(Bo2)M− (N, M = 1, 2) Clusters: Observation Of Hyperhalogen Behavior, Yuan Feng, Hong-Guang Xu, Weijun Zheng, Hongmin Zhao, Anil K. Kandalam, Puru Jena
Physics & Engineering Faculty Publications
No abstract provided.
Communications: Chain And Double-Ring Polymeric Structures: Observation Of Alnh3n+1 − (N=4–8) And Al4h14 −, Xiang Li, Andrej Grubisic, Kit H. Bowen, Anil K. Kandalam, Boggavarapu Kiran, Gerd F. Gantefoer, Puru Jena
Communications: Chain And Double-Ring Polymeric Structures: Observation Of Alnh3n+1 − (N=4–8) And Al4h14 −, Xiang Li, Andrej Grubisic, Kit H. Bowen, Anil K. Kandalam, Boggavarapu Kiran, Gerd F. Gantefoer, Puru Jena
Physics & Engineering Faculty Publications
No abstract provided.
Reactivity Of Neutral And Charged B13 Clusters With O2: A Theoretical Study, William J. Slough, Anil K. Kandalam, Ravindra Pandey
Reactivity Of Neutral And Charged B13 Clusters With O2: A Theoretical Study, William J. Slough, Anil K. Kandalam, Ravindra Pandey
Physics & Engineering Faculty Publications
No abstract provided.
Photoelectron Spectroscopy And Theoretical Studies Of [Com(Pyrene)N]− (M=1,2 And N=1,2) Complexes, Anil K. Kandalam, Puru Jena, Xiang Li, Soren N. Eustis, Kit H. Bowen
Photoelectron Spectroscopy And Theoretical Studies Of [Com(Pyrene)N]− (M=1,2 And N=1,2) Complexes, Anil K. Kandalam, Puru Jena, Xiang Li, Soren N. Eustis, Kit H. Bowen
Physics & Engineering Faculty Publications
No abstract provided.
Photoelectron Spectroscopic Study Of The Anionic Transition Metalorganic Complexes [Fe1,2(Cot)]− And [C(Cot)]−, Xiang Li, Soren N. Eustis, Kit H. Bowen, Anil K. Kandalam
Photoelectron Spectroscopic Study Of The Anionic Transition Metalorganic Complexes [Fe1,2(Cot)]− And [C(Cot)]−, Xiang Li, Soren N. Eustis, Kit H. Bowen, Anil K. Kandalam
Physics & Engineering Faculty Publications
No abstract provided.
Photoelectron Spectroscopic And Theoretical Studies Of Fem − (Coronene)N (M=1,2, N=1,2) Complexes, Xiang Li, Soren Eustis, Kit H. Bowen, Anil K. Kandalam, Puru Jena
Photoelectron Spectroscopic And Theoretical Studies Of Fem − (Coronene)N (M=1,2, N=1,2) Complexes, Xiang Li, Soren Eustis, Kit H. Bowen, Anil K. Kandalam, Puru Jena
Physics & Engineering Faculty Publications
No abstract provided.
Ground State Structures And Photoelectron Spectroscopy Of [Com(Coronene)]− Complexes, Anil K. Kandalam, Boggavarapu Kiran, Puru Jena, Xiang Li, Andrej Grubisic, Kit H. Bowen
Ground State Structures And Photoelectron Spectroscopy Of [Com(Coronene)]− Complexes, Anil K. Kandalam, Boggavarapu Kiran, Puru Jena, Xiang Li, Andrej Grubisic, Kit H. Bowen
Physics & Engineering Faculty Publications
No abstract provided.
Hydrogen Storage And The 18-Electron Rule, Boggavarapu Kiran, Anil K. Kandalam, Puru Jena
Hydrogen Storage And The 18-Electron Rule, Boggavarapu Kiran, Anil K. Kandalam, Puru Jena
Physics & Engineering Faculty Publications
No abstract provided.
Structure And Stability Of Con(Pyridine)M − Clusters: Absence Of Metal Inserted Structures, B. Douglas Edmonds, Anil K. Kandalam, S. N. Khanna, X. Li, A. Grubisic, I. Khanna, K. H. Bowen
Structure And Stability Of Con(Pyridine)M − Clusters: Absence Of Metal Inserted Structures, B. Douglas Edmonds, Anil K. Kandalam, S. N. Khanna, X. Li, A. Grubisic, I. Khanna, K. H. Bowen
Physics & Engineering Faculty Publications
No abstract provided.
Geometry And Electronic Structure Of Vn(Bz)M Complexes, Anil K. Kandalam, B. K. Rao, Puru Jena, Michigan Technological University
Geometry And Electronic Structure Of Vn(Bz)M Complexes, Anil K. Kandalam, B. K. Rao, Puru Jena, Michigan Technological University
Physics & Engineering Faculty Publications
No abstract provided.