ABSTRACT
The conventional 90° sampling geometry is used in most spectrometers. The Raman scattered radiation is viewed at right angles to the direction of excitation. In this way only Rayleigh and Raman scattered radiation enters the monochromator and falls on the detector. Unscattered laser radiation, which is 103 to 104 times as intense as Rayleigh scattering and 107 to 108 times as intense as Raman scattering, does not reach the detector.
