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Proceedings Paper

Autodetachment spectroscopy of a molecular anion using a diode laser
Author(s): Ravi W. Marawar; Daniel C. Cowles; Ray E. Keeler; Andrew P. White; John W. Farley
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Paper Abstract

Autodetachment spectroscopy, a technique for studying molecular anions, has been applied to the past using color-center lasers or visible dye lasers. In the present work, the technique has been extended to employ a relatively weak diode laser. Laser radiation drives an infrared vibrational-rotational transition in the molecular anion NH-. The vibrationally excited anion autodetaches, and the resulting fast neutral is detected. The P1 (6.5, e- > e) transition in the fundamental (1 < -0) band of NH- has been observed near 2806 cm-1 with a signal to noise ratio of 15:1 with a 30-s averaging time. The present experiment has fewer than 500 ions of a single quantum state in the apparatus at once, interacting with 5 microwatts of laser power. Future instrumental improvements can yield orders of magnitude improvement in sensitivity.

Paper Details

Date Published: 17 June 1994
PDF: 6 pages
Proc. SPIE 2124, Laser Techniques for State-Selected and State-to-State Chemistry II, (17 June 1994); doi: 10.1117/12.178132
Show Author Affiliations
Ravi W. Marawar, Univ. of Nevada/Las Vegas (United States)
Daniel C. Cowles, Univ. of Nevada/Las Vegas (United States)
Ray E. Keeler, Univ. of Nevada/Las Vegas (United States)
Andrew P. White, Univ. of Nevada/Las Vegas (United States)
John W. Farley, Univ. of Nevada/Las Vegas (United States)


Published in SPIE Proceedings Vol. 2124:
Laser Techniques for State-Selected and State-to-State Chemistry II
John W. Hepburn, Editor(s)

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