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Articles 1 - 19 of 19
Full-Text Articles in Physics
Oscillator Strength Measurements Of The 5s6s 1s0→5snp 1p1 Rydberg Transitions Of Strontium, S. U. Haq, M. A. Kalyar, M. Rafiq, R. Ali, Naveed K. Piracha, M. A. Baig
Oscillator Strength Measurements Of The 5s6s 1s0→5snp 1p1 Rydberg Transitions Of Strontium, S. U. Haq, M. A. Kalyar, M. Rafiq, R. Ali, Naveed K. Piracha, M. A. Baig
Naveed K. Piracha
We report the experimentally determined oscillator strengths for the 5s6s 1S0→5snp 1P1 Rydberg transitions of strontium using two-step excitation in conjunction with a thermionic diode ion detector. The absolute photoionization cross section from the 5s6s 1S0 excited state has been determined by adjusting the polarization vector of the ionizing laser beam parallel, perpendicular, and at the magic angle with respect to that of the exciting dye laser. The measured absolute value of the photoionization cross section 0.9±0.2 Mb at the 5s threshold is used to extract the f values of the 5s6s 1S0→5snp 1P1 (26≤n≤73) Rydberg transitions. The oscillator strength …
Application Of The Transfer Matrix Method To Reflection Gratings In Positive And Negative Index Materials, Han Li
Han Li
No abstract provided.
Capacitively Coupled Radio-Frequency Discharges In Nitrogen At Low Pressures, L. L Alves, L. Marques, C. D Pintassilgo, W. Wattieaux, Et. Es-Sebbar, J. Berndt, E. Kovačević, N. Carrasco, L. Boufendi, G. Cernogora
Capacitively Coupled Radio-Frequency Discharges In Nitrogen At Low Pressures, L. L Alves, L. Marques, C. D Pintassilgo, W. Wattieaux, Et. Es-Sebbar, J. Berndt, E. Kovačević, N. Carrasco, L. Boufendi, G. Cernogora
Dr. Et-touhami Es-sebbar
This paper uses experiments and modelling to study capacitively coupled radio-frequency (rf) discharges in pure nitrogen, at 13.56 MHz frequency, 0.1–1 mbar pressures and 2–30 W coupled powers. Experiments performed on two similar (not twin) setups, existing in the LATMOS and the GREMI laboratories, include electrical and optical emission spectroscopy (OES) measurements. Electrical measurements give the rf-applied and the direct-current-self-bias voltages, the effective power coupled to the plasma and the average electron density. OES diagnostics measure the intensities of radiative transitions with the nitrogen second-positive and first-negative systems, and with the 811.5 nm atomic line of argon (present as an …
A High-Field Adiabatic Fast Passage Ultracold Neutron Spin Flipper For The Ucna Experiment, Anthony T. Holley, Leah J. Broussard, J. L. Davis, Kevin Hickerson, Takeyasu M. Ito, Chenyu Liu, J. T. M. Lyles, Mark Makela, Russell R. Mammei, Michael P. Mendenhall, Charles L. Morris, R. Mortensen, Robert W. Pattie, Roger Rios, Andy Saunders, Andrew R. Young
A High-Field Adiabatic Fast Passage Ultracold Neutron Spin Flipper For The Ucna Experiment, Anthony T. Holley, Leah J. Broussard, J. L. Davis, Kevin Hickerson, Takeyasu M. Ito, Chenyu Liu, J. T. M. Lyles, Mark Makela, Russell R. Mammei, Michael P. Mendenhall, Charles L. Morris, R. Mortensen, Robert W. Pattie, Roger Rios, Andy Saunders, Andrew R. Young
Robert W. Pattie Jr.
Self-Assembly Of Helical Ribbons, Yevgeniya V. Zastavker, Neer Asherie, Aleksey Lomakin, Jayanti Pande, Joanne M. Donovan, Joel M. Schnur, George B. Benedek
Self-Assembly Of Helical Ribbons, Yevgeniya V. Zastavker, Neer Asherie, Aleksey Lomakin, Jayanti Pande, Joanne M. Donovan, Joel M. Schnur, George B. Benedek
Yevgeniya V. Zastavker
The self-assembly of helical ribbons is examined in a variety of multicomponent enantiomerically pure systems that contain a bile salt or a nonionic detergent, a phosphatidylcholine or a fatty acid, and a steroid analog of cholesterol. In almost all systems, two different pitch types of helical ribbons are observed: high pitch, with a pitch angle of 54 ± 2°, and low pitch, with a pitch angle of 11 ± 2°. Although the majority of these helices are right-handed, a small proportion of left-handed helices is observed. Additionally, a third type of helical ribbon, with a pitch angle in the range …
Dynamical Signature Of The Mott-Hubbard Transition In Ni(S,Se)(2), Yevgeniya Zastavker, Anke Husmann, Deborah Jin, Thomas Rosenbaum, X Yao, J Honig
Dynamical Signature Of The Mott-Hubbard Transition In Ni(S,Se)(2), Yevgeniya Zastavker, Anke Husmann, Deborah Jin, Thomas Rosenbaum, X Yao, J Honig
Yevgeniya V. Zastavker
The transition metal chalcogenide Ni(S,Se)2 is one of the few highly correlated, Mott-Hubbard systems without a strong first-order structural distortion that normally cuts off the critical behavior at the metal-insulator transition. The zero-temperature (T) transition was tuned with pressure, and significant deviations were found near the quantum critical point from the usual T1/2 behavior of the conductivity characteristic of electron-electron interactions in the presence of disorder. The transport data for pressure and temperature below 1 kelvin could be collapsed onto a universal scaling curve.
Tension-Induced Straightening Transition Of Self-Assembled Helical Ribbons, Yevgeniya V. Zastavker, Brice Smith, George B. Benedek
Tension-Induced Straightening Transition Of Self-Assembled Helical Ribbons, Yevgeniya V. Zastavker, Brice Smith, George B. Benedek
Yevgeniya V. Zastavker
Helical ribbons with pitch angles of either 11° or 54° self-assemble in a wide variety of quaternary surfactant-phospholipid/fatty acid-sterol-water systems. By elastically deforming these helices, we examined their response to uniaxial forces. Under sufficient tension, a low pitch helix reversibly separates into a straight domain with a pitch angle of 90° and a helical domain with a pitch angle of 16.5°. Using a newly developed continuum elastic free energy model, we have shown that this phenomenon can be understood as a first order mechanical phase transition.
Ionization Photophysics And Rydberg Spectroscopy Of Diacetylene, M. Schwell, Y. Benilan, N.. Fray, M.-C. Gazeau, Et. Es-Sebbar, F.-G. Levrel, N. Campion, S. Leach
Ionization Photophysics And Rydberg Spectroscopy Of Diacetylene, M. Schwell, Y. Benilan, N.. Fray, M.-C. Gazeau, Et. Es-Sebbar, F.-G. Levrel, N. Campion, S. Leach
Dr. Et-touhami Es-sebbar
Photoionization of diacetylene was studied using synchrotron radiation over the range 8–24 eV, with photoelectron-photoion coincidence (PEPICO) and threshold photoelectron–photoion coincidence (TPEPICO) techniques. Mass spectra, ion yields, total and partial ionization cross-sections were measured. The adiabatic ionization energy of diacetylene was determined as IEad = (10.17 ± 0.01) eV, and the appearance energy of the principal fragment ion C4H+ as AE = (16.15 ± 0.03) eV. Calculated appearance energies of other fragment ions were used to infer aspects of dissociation pathways forming the weaker fragment ions , C3H+, and C2H+. Structured autoionization features observed in the PEPICO spectrum of diacetylene …
Ultrashort Pulse Propagation And Multi-Chromatic Ionization In Dielectrics, Jeremy Gulley
Ultrashort Pulse Propagation And Multi-Chromatic Ionization In Dielectrics, Jeremy Gulley
Jeremy R. Gulley
No abstract is currently available.
Performance Analysis Of Nitride Alternative Plasmonic Materials For Localized Surface Plasmon Applications, U. Guler, Gururaj V. Naik, Alexandra Boltasseva, Vladimir M. Shalaev, Alexander V. Kildishev
Performance Analysis Of Nitride Alternative Plasmonic Materials For Localized Surface Plasmon Applications, U. Guler, Gururaj V. Naik, Alexandra Boltasseva, Vladimir M. Shalaev, Alexander V. Kildishev
U. Guler
We consider methods to define the performance metrics for different plasmonic materials to be used in localized surface plasmon applications. Optical efficiencies are shown to be better indicators of performance as compared to approximations in the quasistatic regime. The near-field intensity efficiency, which is a generalized form of the well-known scattering efficiency, is a more flexible and useful metric for local-field enhancement applications. We also examine the evolution of the field enhancement from a particle surface to the far-field regime for spherical nanoparticles with varying radii. Titanium nitride and zirconium nitride, which were recently suggested as alternative plasmonic materials in …
Nonlinear Ultrashort Pulse Propagation And Multi-Chromatic Ionization In Bulk Dielectrics, Jeremy Gulley
Nonlinear Ultrashort Pulse Propagation And Multi-Chromatic Ionization In Bulk Dielectrics, Jeremy Gulley
Jeremy R. Gulley
No abstract is currently available.
Microwave Optics Research, Allen Andersen, Todd Lines, Josh Barney
Microwave Optics Research, Allen Andersen, Todd Lines, Josh Barney
Allen Andersen
The BYU-Idaho Physics Department x-band microwave optics equipment was originally intended for use in classroom demonstrations. I evaluated this equipment for use in research. I designed and built additional equipment needed in order to perform attenuation and other experiments then used it to conduct research on the transmission properties of paper and other substances. The new equipment allowed me to create a standard experimental procedure, take reasonably accurate measurements, and reduce undesired standing wave effects. Mathematical and experimental analysis was done to determine the necessary parameters of the new equipment. The new apparatus is comparable to setups featured in published …
Volatile Products Controlling Titan’S Tholins Production, N. Carrasco, T. Gautier, Et. Es-Sebbar, P. Pernot, G. Cernogora
Volatile Products Controlling Titan’S Tholins Production, N. Carrasco, T. Gautier, Et. Es-Sebbar, P. Pernot, G. Cernogora
Dr. Et-touhami Es-sebbar
A quantitative agreement between nitrile relative abundances and Titan’s atmospheric composition was recently shown with a reactor simulating the global chemistry occurring in Titan’s atmosphere [Gautier et al. (2011) Icarus, 213: 625]. Here we present a complementary study on the same reactor using an in-situ diagnostic of the gas phase composition. Various initial N2-CH4 gas mixtures (methane varying from 1 to 10%) are studied, with a monitoring of the methane consumption and of the stable gas neutrals by in-situ mass spectrometry. Atomic hydrogen is also measured by optical emission spectroscopy. A positive correlation is found between atomic hydrogen abundance and …
Vuv Photoionization Of Acetamide Studied By Electron / Ion Coincidence Spectroscopy In The 8-24 Ev Photon Energy Range, M. Schwell, Y. Bénilan, N. Fray, M.-C Gazeau, Et. Es-Sebbar, Gustavo A. Garcia, L. Nahon, N. Champion, S. Leach
Vuv Photoionization Of Acetamide Studied By Electron / Ion Coincidence Spectroscopy In The 8-24 Ev Photon Energy Range, M. Schwell, Y. Bénilan, N. Fray, M.-C Gazeau, Et. Es-Sebbar, Gustavo A. Garcia, L. Nahon, N. Champion, S. Leach
Dr. Et-touhami Es-sebbar
A VUV photoionization study of acetamide was carried out over the 8-24 eV photon energy range using synchrotron radiation and photoelectron/photoion coincidence (PEPICO) spectroscopy. Threshold photoelectron photoion coincidence (TPEPICO) measurements were also made. Photoion yield curves and branching ratios were measured for the parent ion and six fragment ions. The adiabatic ionization energy of acetamide was determined as I.E (12A’) = (9.71±0.02) eV, in agreement with an earlier reported photoionization mass spectrometry (PIMS) value. The adiabatic energy of the first excited state of the ion, 12A”, was determined to be ≈ 10.1 eV. Assignments of the fragment ions and the …
Binary Nanoparticle Dispersed Metamaterial Implementation And Characterization, Han Li
Binary Nanoparticle Dispersed Metamaterial Implementation And Characterization, Han Li
Han Li
No abstract provided.
Using Frequency-Narrowed, Tunable Laser Diode Arrays With Integrated Volume Holographic Gratings For Spin-Exchange Optical Pumping At High Resonant Fluxes And Xenon Densities, Nicholas Whiting, Panayiotis Nikolaou, Neil A. Eschmann, Michael J. Barlow, R Lammert, J Ungar, W Hu, Laurent Vaissie, Boyd M. Goodson
Using Frequency-Narrowed, Tunable Laser Diode Arrays With Integrated Volume Holographic Gratings For Spin-Exchange Optical Pumping At High Resonant Fluxes And Xenon Densities, Nicholas Whiting, Panayiotis Nikolaou, Neil A. Eschmann, Michael J. Barlow, R Lammert, J Ungar, W Hu, Laurent Vaissie, Boyd M. Goodson
Nicholas Whiting
Measurement Of The Neutron -Asymmetry Parameter A0 With Ultracold Neutrons, Bradley Plaster, R. Rios, Thomas J. Bowles, Leah J. Broussard, Richard Carr, Steven Clayton, Scott Currie, Bradley W. Filippone, Peter Geltenbort, Kevin P. Hickerson, J. Todd Hoagland, Gary E. Hogan, B. Hona, Anthoney T. Holley, Takeyasu M. Ito, Chenyu Liu, Jingyang Liu, Mark Makela, J. W. Martin, Daniel Melconian, Michael P. Mendenhall, Charles L. Morris, R. Mortensen, Robert W. Pattie, Margaret L. Pitt, John C. Ramsey, R. Russell, Andy Saunders, R. Schmid, Susan J. Seestrom, Sky Sjue, Walter E. Sondheim, E. Tatar, B. Tipton, Robert B. Vogelaar, Brittany Vorndick, Christopher Wrede, Y. P. Xu, H. Yan, Andrew R. Young, J. Yuan
Measurement Of The Neutron -Asymmetry Parameter A0 With Ultracold Neutrons, Bradley Plaster, R. Rios, Thomas J. Bowles, Leah J. Broussard, Richard Carr, Steven Clayton, Scott Currie, Bradley W. Filippone, Peter Geltenbort, Kevin P. Hickerson, J. Todd Hoagland, Gary E. Hogan, B. Hona, Anthoney T. Holley, Takeyasu M. Ito, Chenyu Liu, Jingyang Liu, Mark Makela, J. W. Martin, Daniel Melconian, Michael P. Mendenhall, Charles L. Morris, R. Mortensen, Robert W. Pattie, Margaret L. Pitt, John C. Ramsey, R. Russell, Andy Saunders, R. Schmid, Susan J. Seestrom, Sky Sjue, Walter E. Sondheim, E. Tatar, B. Tipton, Robert B. Vogelaar, Brittany Vorndick, Christopher Wrede, Y. P. Xu, H. Yan, Andrew R. Young, J. Yuan
Robert W. Pattie Jr.
Picosecond Rotationally Resolved Stimulated Emission Pumping Spectroscopy Of No, Chakree Tanjaroon, Scott Reeve, Alan Ford Ford, W. Dean Murray, Kevin Lyon, Bret Yount, Dan Britton, William Burns, Susan D. Allen, J. Bruce Johnson
Picosecond Rotationally Resolved Stimulated Emission Pumping Spectroscopy Of No, Chakree Tanjaroon, Scott Reeve, Alan Ford Ford, W. Dean Murray, Kevin Lyon, Bret Yount, Dan Britton, William Burns, Susan D. Allen, J. Bruce Johnson
Scott Reeve
No abstract provided.
Cavity Ringdown Spectroscopy Of 13c2h2 In The 12900-13400 Region.Pdf, Christopher J. Lue, Michael Sullivan, Mark Draganjac, Scott Reeve
Cavity Ringdown Spectroscopy Of 13c2h2 In The 12900-13400 Region.Pdf, Christopher J. Lue, Michael Sullivan, Mark Draganjac, Scott Reeve
Scott Reeve
No abstract provided.