Trace Detection Of Small Molecules By Pulsed-Ultraviolet (UV) Laser Raman Spectroscopy

P. J. Hargis Jr.

doi:10.1117/12.965826

8 September 1981 Trace Detection Of Small Molecules By Pulsed-Ultraviolet (UV) Laser Raman Spectroscopy

P. J. Hargis Jr.

Proceedings Volume 0286, Laser Spectroscopy for Sensitive Detection; (1981) https://doi.org/10.1117/12.965826
Event: 1981 Technical Symposium East, 1981, Washington, D.C., United States

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.

Citation Download Citation

P. J. Hargis Jr. "Trace Detection Of Small Molecules By Pulsed-Ultraviolet (UV) Laser Raman Spectroscopy", Proc. SPIE 0286, Laser Spectroscopy for Sensitive Detection, (8 September 1981); https://doi.org/10.1117/12.965826

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