RAPID SCANNING RAMAN SPECTROSCOPY.

Author Institution: Facult\'e des Sciences, Universit\'e de LilleRecent progress in spectroscopic techniques enables us to realize very rapid scanning of Raman spectra: Actually the laser is the source suited best to excite intense Raman scattering in samples of very small volume. We have employed three different techniques of detection: (1) Rapid scanning of the spectrum with large aperture monochromators. Scanning speeds of the order of $1000 cm^{-1}$ per second have been achieved, but each spectral element is observed only during a small fraction of the total time. (2) Simultaneous recording of the whole spectral region of interest, which avoids all waste of information, by means of photo tubes with electron optics. A complete spectrum can be recorded every millisecond from a pure sample excited by a cw-laser. (3) Excitation by pulsed lasers. One complete spectrum is recorded for every pulse ($