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[en] The Rosencwaig-Gersho photoacoustic transformation is extended to the case of the short-period superlattices formed by gytropic nonmagnetic cubic crystals. The potentialities of photoacoustic spectroscopy when applied to superlattices and the control of their parameters are considered. 18 refs., 4 figs
Journal
[en] The electroacoustic microscopy uses the acoustic wave creation due to periodical heating of the sample by the incident electron beam. This technique, although a new one, is derived from an older methodology called photoacoustic spectrocopy. The photoacoustic effect has some advantages for crystal defect and impurity diffusion visualisation, which can be evaluated by depth profile got non-destructively in shifting the signal detection with regard to the excitation
[fr]
La microscopie electroacoustique utilise la creation d'ondes acoustiques dues a l'echauffement periodique de l'echantillon par le faisceau d'electrons incidents. Cette technique bien que nouvelle est une derivee d'une methodologie plus ancienne et communement designee sous les termes de photoacoustique ou spectroscopie photoacoustique. L'effet photoacoustique offre certains avantages pour la visualisation des defauts cristallins et des diffusions d'impuretes, qui peuvent etre evalues par des profils en profondeur obtenus de facon non destructive en decalant la detection du signal par rapport a l'excitationSource
Benoit, D.; Bresse, J.F.; Grillon, F.; Maurice, F.; Meny, L.; Pouchou, J.L.; Roinel, N.; Ruste, J. (eds); Association Nationale de la Recherche Technique (ANRT), 75 - Paris (France); 204 p; ISBN 2-900-19507-1; 
; 1985; p. I.1-I.13; Les Editions de Physique; Orsay (France); Summer school on microanalysis and scanning electron microscopy; Saint-Martin-d'Heres (France); 11-16 Sep 1978
; 1985; p. I.1-I.13; Les Editions de Physique; Orsay (France); Summer school on microanalysis and scanning electron microscopy; Saint-Martin-d'Heres (France); 11-16 Sep 1978
No abstract available
Journal
Review of Scientific Instruments; ISSN 0034-6748; ; v. 72(12); [10 p.]
; v. 72(12); [10 p.]
[en] Highlights: • Energy-resolved distribution of electron traps (ERDT) in metal-oxide powders was measured. • Reversed double-beam photoacoustic spectroscopy (RDB-PAS) was developed for ERDT analysis. • ERDT analysis enabled estimation of valence-band top energy of titania samples. - Abstract: A novel instrumental methodology, reversed double-beam photoacoustic spectroscopy (RDB-PAS), was developed for measuring the energy-resolved distribution of electron traps (ERDT) of metal-oxide powders. In the RDB-PAS measurement, electrons in the valence band of a powder sample are directly excited to electron traps (ETs) and accumulated in the ETs from the deeper (anodic) side to the shallower (cathodic) side by wavelength-scanned continuous light, and the increase in photoabsorption of electron-filled ETs is measured by modulated light at a fixed wavelength by PAS. It was shown that ERDT/CBB (conduction-band bottom) patterns measured by RDB-PAS can be used for not only identification and detailed characterization of a wide range of metal-oxide powder samples but also estimation of difference in apparent valence-band top (VBT) position.
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