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### Proceedings Paper

Velocity Modulation Laser Absorption Spectroscopy of Molecular Ions
Author(s): C. S. Gudeman; C. C. Martner; M. H. Begemann; E. Schafer; J. Pfaff; R. J. Saykally
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Paper Abstract

For several decades optical emission spectroscopy has been the only technique available for the investigation of electronic spectra and structures of molecular ions.1-3 The inherently strong emission produced by electronic transitions at visible and ultraviolet wavelengths has been critically important to such studies of charged species, because the chemical reactivity and Coulomb repulsion of ions limit their steady state densities to extremely low levels (typically 1 ppm of the total gas density). The sensitivity of optical emission techniques is, however, compromised by several other factors, including a rather low resolution compared to that attainable in laser applications, the strong interference from emissions of the far more abundant neutral molecular species, the requirement that a sizeable fraction of the ions be electronically excited, and the unavailability of ro-vibronic population information on the lower state of the transition. Nevertheless the majority of all rotationally resolved electronic spectra for molecular ions observed to date have been detected and measured by optical emission spectroscopy, and without this ground-work the development of more sophisticated laser techniques would have been greatly hampered.

Paper Details

Date Published: 19 October 1983
PDF: 4 pages
Proc. SPIE 0426, Laser-Based Ultrasensitive Spectroscopy and Detection V, (19 October 1983); doi: 10.1117/12.936245
Show Author Affiliations
C. S. Gudeman, University of California (United States)
C. C. Martner, University of California (United States)
M. H. Begemann, University of California (United States)
E. Schafer, University of California (United States)
J. Pfaff, University of California (United States)
R. J. Saykally, University of California (United States)

Published in SPIE Proceedings Vol. 0426:
Laser-Based Ultrasensitive Spectroscopy and Detection V
Richard A. Keller, Editor(s)