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Full-Text Articles in Physical Sciences and Mathematics
Statistics Of Multicharge Centers In Semiconductors - Applications, David C. Look
Statistics Of Multicharge Centers In Semiconductors - Applications, David C. Look
Physics Faculty Publications
A general formula is derived for the electron occupation numbers appropriate for multicharge centers in semiconductors, including excited states. The results are used to rederive and generalize several formulas of interest in the literature, in order to show exactly how the degeneracies of individual states enter in. Particular attention is paid to certain subjects which are sometimes confusing, such as how the statistics of band states differ from those those of localized states. Another subject of much recent interest, negative-U centers, is dealt with in some detail. We show how the dependence of the average occupation number on Fermi …
Glory In Optical Backscattering From Air Bubbles, Dean S. Langley, Philip L. Marston
Glory In Optical Backscattering From Air Bubbles, Dean S. Langley, Philip L. Marston
Physics Faculty Publications
Observations of light backscattered from air bubbles in a viscous liquid demonstrate an enhancement due to axial focusing. A physical-optics approximation for the cross-polarized scattering correctly describes the spacing of regular features observed. The non-cross polarized scattering is not adequately described by a single class of rays.
Optical Pulse Compression In A Cholesteric Liquid Crystal, D. N. Ghosh Roy, D.V.G.L.N. Rao, H. Bronk
Optical Pulse Compression In A Cholesteric Liquid Crystal, D. N. Ghosh Roy, D.V.G.L.N. Rao, H. Bronk
Physics Faculty Publications
A 20‐ns laser pulse is compressed to nearly 2.5 ns in a 10‐cm‐long sample of liquid‐crystal cholesteryl oleate in the isotropic phase. Pulse compression in a length as short as only 5 cm has been observed. A semiquantitative explanation is given in terms of stimulated Brillouin scattering.
Negative Acceleration Components For A Relativistic Particle, James A. Lock
Negative Acceleration Components For A Relativistic Particle, James A. Lock
Physics Faculty Publications
Newtonian acceleration is considered in the light of special relativity theory with the result that the component of acceleration in the direction of an arbitrary applied force is always positive.(AIP)
Observation Of The Transition From Semiconductor To High-Tc Superconductor In (Snxeu1-X)Ymo6s8 Under High Pressure, D. W. Harrison, K. C. Lim, J. D. Thompson, C. Y. Huang, Paul D. Hambourger, H. L. Luo
Observation Of The Transition From Semiconductor To High-Tc Superconductor In (Snxeu1-X)Ymo6s8 Under High Pressure, D. W. Harrison, K. C. Lim, J. D. Thompson, C. Y. Huang, Paul D. Hambourger, H. L. Luo
Physics Faculty Publications
Pressure-induced high-temperature superconductivity is observed in semiconducting (SnxEu1-x)yMo6S8, where 0<~x<~0.1 and y=1.0 and 1.2, having a carrier concentration ≃1019/cm3 at 4.2 K as determined from Hall-effect measurements. Above a threshold pressure ≃7 kbar, superconductivity appears with dTc/dP≃2 K/kbar. The maximum superconducting temperature (Tc∼10 K), reached at ∼ 12 kbar, represents the highest pressure-induced Tc in any semiconductor. For P>~13 kbar, the temperature-dependent resistance appears metallic.
O++ In The Venusian Ionosphere, Jane L. Fox, G. A. Victor
O++ In The Venusian Ionosphere, Jane L. Fox, G. A. Victor
Physics Faculty Publications
It is shown that the revised photochemical theory for O++ in the earth's ionopshere, where double photoionization of O is the dominant source, is consistent with recent O++ measurements on Venus. A rate coefficient of 1.5 × 10−10 cm³ s−1 for O++ + O is obtained, and the possible importance of O++ chemistry on minor atomic ions and airglow emissions is explored.
Hall Effect At High Pressure In (Snxeu1-X)1.2mo6s8, Paul D. Hambourger, C. Y. Huang, H. L. Luo
Hall Effect At High Pressure In (Snxeu1-X)1.2mo6s8, Paul D. Hambourger, C. Y. Huang, H. L. Luo
Physics Faculty Publications
No abstract provided.