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Proceedings Paper

Trace Detection Of Small Molecules By Pulsed-Ultraviolet (UV) Laser Raman Spectroscopy
Author(s): P. J. Hargis Jr.
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Paper Abstract

A 100-mJ/pulse, 10-Hz KrF laser was used to reduce vibrational Raman detection limits to the low parts-per-million level for a number of molecules of interest in pollution monitoring, combustion diagnostics, chemical vapor deposition, and reactive plasma etching. No inter-ferences from stimulated Raman scattering or multiphoton photodissociation were observed for the molecules investigated. Limitations to the use of spontaneous Raman scattering, such as poor discrimination against fluorescence, are greatly minimized because of the combination of large signal levels and relatively narrow wavelength band containing the Raman-shifted lines. Even though present results are limited by the 1.2 nm bandwidth of the KrF laser, it was possible to detect the 2 to 4 parts-per-million CH4 present in room air with a signal-to-noise of ~20.

Paper Details

Date Published: 8 September 1981
PDF: 7 pages
Proc. SPIE 0286, Laser Spectroscopy for Sensitive Detection, (8 September 1981); doi: 10.1117/12.965826
Show Author Affiliations
P. J. Hargis Jr., Sandia National Laboratories (United States)

Published in SPIE Proceedings Vol. 0286:
Laser Spectroscopy for Sensitive Detection
Jerry A. Gelbwachs, Editor(s)

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