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Full-Text Articles in Physics
Electron Attachment To Molecules In Very High Pressure Gases, Ronald Earl Goans
Electron Attachment To Molecules In Very High Pressure Gases, Ronald Earl Goans
Doctoral Dissertations
Introduction: The study of low energy electron attachment to molecules is of fundamental importance in both the physical and biological sciences. These processes are important in the physical sciences because many molecular parameters can be directly or indirectly determined from electron attachment studies. Such parameters include electron affinities of molecules, electron attachment rate constants and cross sections, autoionization lifetimes of transient negative ion species, bond dissociation energies, and shapes of molecular and negative ion potential energy curves. Electron attachment studies are important in biology because of the large number of low energy electrons that are produced when ionizing radiation interacts …
Cross Sections For Photoionization Of The 6²P-Fine Structure Levels Of Cesium, John Daniel Jones
Cross Sections For Photoionization Of The 6²P-Fine Structure Levels Of Cesium, John Daniel Jones
Doctoral Dissertations
"The cross sections for photoionization of excited cesium from the 62P3/2- and 6²P1/2-fine structure levels have been measured using a triple crossed-beam apparatus. Two photon beams, one for excitation and one for ionization, impinge upon an atomic beam and produce ions at the point of intersection. The relative cross section is determined from a knowledge of the ion count rate and the relative photon flux of the ionization light. The results are normalized to available theoretical calculations and compared with recombination measurements in cesium plasmas. The present cross sections are found to decrease with …
Surface Electromagnetic Waves With Damping I. Isotropic Media Ii. Anisotropic Media, Gary Shannon Kovener
Surface Electromagnetic Waves With Damping I. Isotropic Media Ii. Anisotropic Media, Gary Shannon Kovener
Doctoral Dissertations
Paper 1: “Surface electromagnetic wave (SEW) dispersion curves are usually calculated using a simple equation derived from Maxwell’s equations and boundary conditions. When complex dielectric functions are used for the two media, the component of the propagation vector along the surface kx becomes infinite as the frequency ω approaches the surface polariton frequency ωs if ω is considered complex and kx real. On the other hand, if kx is considered complex and ω real, the dispersion curves bend back toward smaller kx as ω approaches ωs. We have previously demonstrated that both types …
Double Reflection Dips - From Grating Ruled Semiconductors, Le-Fu Teng
Double Reflection Dips - From Grating Ruled Semiconductors, Le-Fu Teng
Doctoral Dissertations
"The double dips, previously observed by Fischer, Anderson, et al., which appeared in the reflection spectra of grating surfaces on the Te-doped semiconductors GaAs and InSb around the plasmon and phonon frequencies have been measured in more detail. In the plasmon region, several possible explanations of the phenomenon are discussed. A simple equation checked with the rigorous theory is proposed and is shown to fit the data well. In the phonon region, the extra dip is calculated and identified as being caused by surface phonons"--Abstract, page ii.