High-resolution laser spectroscopy of molecular ions

John W. Farley

doi:10.1117/12.143075

22 April 1993 High-resolution laser spectroscopy of molecular ions

John W. Farley

Proceedings Volume 1858, Laser Techniques for State-Selected and State-to-State Chemistry; (1993) https://doi.org/10.1117/12.143075
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

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^-.

Citation Download Citation

John W. Farley "High-resolution laser spectroscopy of molecular ions", Proc. SPIE 1858, Laser Techniques for State-Selected and State-to-State Chemistry, (22 April 1993); https://doi.org/10.1117/12.143075

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