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Experiments on Fluctuations in Optically Quenched CdS and CdSe Crystals
Author(s) -
Herczfeld P. R.,
van Vliet K. M.,
Pai M. D.
Publication year - 1968
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19680270224
Subject(s) - quenching (fluorescence) , infrared , diffusion , absorption (acoustics) , noise (video) , spectral line , absorption spectroscopy , materials science , excitation , irradiation , molecular physics , analytical chemistry (journal) , optics , chemistry , atomic physics , physics , fluorescence , thermodynamics , chromatography , quantum mechanics , astronomy , artificial intelligence , computer science , image (mathematics) , nuclear physics
Measurements of electronic fluctuation spectra in CdS and CdSe crystals, irradiated by primary light, causing excitation, and infrared light, causing quenching, are reported. For the primary light in the tail absorption region, a marked effect is found. Even for moderate quenching, the noise often increases by an order of magnitude; moreover, a characteristic ω −5/2 ‐spectrum appears, as has not been observed in photoconductors hitherto. At low temperatures the relative variance is close to unity or even sub‐poissonian. At room temperature, thermal quenching presumably may enhance the noise, though in lesser degree than infrared quenching. In the fundamental absorption band, infrared quenching enhances the noise, but does not alter the spectral shape, which generally shows a diffusion behavior signified by an ω −3/2 ‐dependence. A qualitative discussion of these features is given. A quantitative description, particularly of the ω −5/2 ‐spectrum is referred to a subsequent article [3].