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Proceedings Paper

Use Of A Free-Expansion Jet In Ultrahigh Resolution Raman Spectroscopy
Author(s): James J. Valentini; Peter Esherick; Adelbert Owyoung
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Paper Abstract

Rotationally-resolved, ultra-high-resolution stimulated Raman spectra of CH4, CD4, and SF6 have been obtained in cw and pulsed free-expansion jets, using a simple and inexpensive nozzle-and-vacuum-chamber apparatus. Through variation of the nozzle orifice diameter, nozzle backing pressure, and axial location of the spectroscopic probe region it is possible to nearly independently control the spectral Doppler width, rotational temperature, and molecular density in the jet. Using relatively mild expansion conditions we have been able to cool a pure methane jet to a rotational temperature of 13K. We show here how this con-trol of temperature, independent of density, allows separation of otherwise unresolvable spectral features and unambiguous identification of band-heads, hot-bands, and other spec-tral features.

Paper Details

Date Published: 30 December 1981
PDF: 5 pages
Proc. SPIE 0288, Los Alamos Conf on Optics '81, (30 December 1981); doi: 10.1117/12.932057
Show Author Affiliations
James J. Valentini, University of California (United States)
Peter Esherick, Sandia National Laboratories (United States)
Adelbert Owyoung, Sandia National Laboratories (United States)

Published in SPIE Proceedings Vol. 0288:
Los Alamos Conf on Optics '81
Donald H. Liebenberg, Editor(s)

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