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Author |
Gershenzon, E. M.; Gol'tsman, G. N.; Mirskii, G. I. |
Title |
Submillimeter backward-wave-tube spectrometer-relaxometer |
Type |
Journal Article |
Year |
1987 |
Publication |
Pribory i Tekhnika Eksperimenta |
Abbreviated Journal |
Pribory i Tekhnika Eksperimenta |
Volume |
30 |
Issue |
4 |
Pages |
131-137 |
Keywords |
BWO, applications |
Abstract |
A backward-wave-tube (BWT) spectrometer-relaxometer is described that is designed for study of the relaxation characteristics of photoconductors in the wavelength range of 2-0.25 mm – in particular, to measure the relaxation times of the submillimeter photoconductivity of germanium in the range of 10[sup:-4]-10[sup:-9] sec and to determine from these data the concentration of compensating impurities of from 10[sup:10] to 10[sup:14] cm[sup:-3]. The instrument uses the beats of the oscillations of two BWTs and records the amplitude-frequency response of the specimen with variation of the beat frequency from 10[sup:4] to 10[sup:8] Hz with accumulation of the desired signal for less than or equal to1 sec by means of a quadrature synchronous detector. The beat frequency is stabilized and the quadrature voltages of the synchronous detector are formed by means of phase-locked loops. |
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1699 |
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Author |
Kostiuk, T.; Spears, D. |
Title |
30 μm heterodyne receiver |
Type |
Journal Article |
Year |
1987 |
Publication |
Int. J. Infrared and Millimeter Waves |
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Volume |
8 |
Issue |
10 |
Pages |
1269-1279 |
Keywords |
HgCdTe detector mixer |
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235 |
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Author |
Uchiki, Hisao; Kobayashi, Takayoshi; Sakaki, Hiroyuki |
Title |
Photoluminescence and energyâ€loss rates in GaAs quantum wells under highâ€density excitation |
Type |
Journal Article |
Year |
1987 |
Publication |
J. Appl. Phys. |
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Volume |
62 |
Issue |
3 |
Pages |
1010-1016 |
Keywords |
2DEG, GaAs/AlGaAs, heat flow, electron-phonon, hole-phonon, carrier-phonon, interactions |
Abstract |
The timeâ€resolved luminescence spectra from excited conduction subbands in three samples of multiâ€quantumâ€well GaAs/AlxGa1-xAs (x=0.3 and 1) semiconductors with several well widths and barrier heights were obtained under highâ€density excitations by a 30â€ps pulsed laser at 532 nm, which generated electron–hole pairs to the concentration of 1010–1013/cm2 per well per pulse at 77 K. The temperature and the Fermi energy of electron were determined by fitting best the constructed timeâ€resolved spectrum to the observed, and the timeâ€dependent electron energy was obtained by using these parameters. The energyâ€loss rates of hot electrons are at least twice smaller than the calculated ones induced by the electronâ€polar phonon scattering, including the screening effect due to the high carrier density. |
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635 |
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Santhanam, P.; Wind, S.; Prober, D. E. |
Title |
Localization, superconducting fluctuations, and superconductivity in thin films and narrow wires of aluminum |
Type |
Journal Article |
Year |
1987 |
Publication |
Phys. Rev. B |
Abbreviated Journal |
Phys. Rev. B |
Volume |
35 |
Issue |
7 |
Pages |
3188-3206 |
Keywords |
Al films; electron-phonon scattering; electron-electron scattering; Disordered structures; amorphous and glassy solids, Relaxation times and mean free paths, Galvanomagnetic and other magnetotransport effects |
Abstract |
We report a comprehensive set of experiments on wide and narrow thin-film strips of aluminum which test the predictions of recent localization theory. The experiments on wide films in the two-dimensional regime confirm the theoretical predictions and also yield insight into inelastic mechanisms and spin-orbit scattering rates. Our extension of the existing theory for one-dimensional systems to include spin-orbit scattering and Maki-Thompson superconducting fluctuations is verified by the experiments. We find clear evidence for one-dimensional localization, with inferred inelastic rates identical to those in two-dimensional films. The prediction of the localization theory for a dimensional crossover from two-dimensional to one-dimensional behavior is also confirmed. We have reanalyzed the results of some previous experiments on thin films and narrow wires in light of these results. |
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RPLAB @ gujma @ |
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757 |
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Title |
ГОСТ 2.119-73. ЕСКД. Эскизный проект |
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Book Whole |
Year |
1987 |
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gost, detproj |
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867 |
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