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Ames Laboratory

Plasma and Beam Physics

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Full-Text Articles in Physics

An Attempt To Reproduce The Schwarz‐Hora Effect, Roger K. Hadley, David W. Lynch, Edward Joseph Stanek Ii, E. A. Rosauer Sep 1971

An Attempt To Reproduce The Schwarz‐Hora Effect, Roger K. Hadley, David W. Lynch, Edward Joseph Stanek Ii, E. A. Rosauer

Physics and Astronomy Publications

Several attempts were made to observe the modulation of an electron beam by a laser (the Schwarz‐Hora effect). These were not successful and possible reasons are reported.


Longitudinal-Optical-Phonon-Plasmon Coupling In Gaas, C. G. Olson, David W. Lynch Jan 1969

Longitudinal-Optical-Phonon-Plasmon Coupling In Gaas, C. G. Olson, David W. Lynch

Physics and Astronomy Publications

Infrared reflectivity measurements have been made at 78°K on three samples of GaAs, doped with Te so that the plasma frequency is nearly equal to the long-wavelength LO phonon frequency. There are two prominent dips in the reflectivity spectra, but instead of occurring near the plasma frequency and LO mode frequency, they occur at the frequencies of the two normal modes of the coupled plasmon-LO-phonon system, as predicted by Varga and by Singwi and Tosi. From the reflectivity spectra at 78°K, values of the electron effective mass of 0.067, 0.073, and 0.077me are obtained for ...