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Proceedings Paper

High-resolution laser spectroscopy of molecular ions
Author(s): John W. Farley
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Paper Abstract

Laser spectroscopic investigations of positive and negative molecular ions are described. The experiments include studies of anions in an ion beam apparatus and of cations in a velocity- modulated discharge. In the coaxial beams apparatus, an infrared laser beam overlaps a 3 keV beam of molecular anions. The laser beam induces vibrational-rotational transitions in a negative ion. The vibrationally excited ion then autodetaches, producing a fast neutral. The neutral is then detected by collisional ejection of secondary electrons. This autodetachment technique has a background count rate near zero, and is, therefore, very sensitive. The transitions are sub-Doppler because of a velocity-bunching effect occurring in fast ion beams. Molecular anions whose vibrational-rotational spectra were measured include NH- and HNO-.

Paper Details

Date Published: 22 April 1993
PDF: 9 pages
Proc. SPIE 1858, Laser Techniques for State-Selected and State-to-State Chemistry, (22 April 1993); doi: 10.1117/12.143075
Show Author Affiliations
John W. Farley, Univ. of Nevada/Las Vegas (United States)

Published in SPIE Proceedings Vol. 1858:
Laser Techniques for State-Selected and State-to-State Chemistry
Cheuk Yiu Ng, Editor(s)

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