Resonant Raman Effect in Crystals and Liquids.
Abstract
The first of two main objectives in this research was to further the basic understanding of resonance Raman scattering in solids and in gases. The following two new phenomena were observed: (1) resonant cancellation in the TO Raman cross section; and (2) selective resonant enhancement in the two-phonon cross section when the incident photon energy is near the indirect energy gap. The second objective was to design and develop and optical parallel-channel detection system for ultra-low light level spectroscopy. In addition to the obvious improvement in the signal-to-noise ratio and in the speed of acquiring data, spatially resolved gas concentration emerging from a nozzle can be mapped out by using laser Raman intensity from a one 1 msec ruby laser pulse. This introduces a totally new diagnostic tool for the study of gas and combustion dynamics.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1976
- Accession Number
- ADA032185
Entities
People
- Richard K. Chang
Organizations
- Yale University