Multichannel Raman spectroscopy of monolayers on surfaces using a CCD detector.

Spontaneous Raman scattering from adsorbates on surfaces is a very powerful vibrational spectroscopy technique due to the very large frequency range and high resolution currently possible with visible lasers and spectrometers. Because of the extremely low Raman cross sections of nonresonant molecules, one must use either some sort of signal enhancement technique or long integrations using multichannel detection in order to have monolayer sensitivity. In collaboration with Steve Dierker, I have used a backthinned, liquid nitrogen cooled CCD detector to obtain high quality multichannel unenhanced Raman scattering spectra from organic monolayers on surfaces. A short description of our detection system will be given along with a comparison with other commercially available multichannel detectors suitable for low light level Raman detectors. (This paper is a summary of an invited talk to be given at the Topical Meeting on Quantum Limited Imaging and Image Processing of the Optical Society of America, Honolulu Hawaii, April 2, 1986.)