HIGH RESOLUTION ONE-PHOTON IONIZATION CROSS SECTION OF NO USING THIRD-HARMONIC GENERATION
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Date
1985
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Ohio State University
Abstract
The high resolution $(\leq 1.5 cm^{-1})$ one-photon ionlzation cross section of NO is obtained in a section of the vacuum ultraviolet (VUV) region ($77200 cm^{-1}$ to $78600 cm^{-1}$). VUV radiation is produced by frequency tripling the output of a pulsed UV dye laser (third-harmonic generation). This provides a tunable VUV source of much narrower band width than can usually be obtained when using conventional continuum lamp or synchrotron radiation sources. Further simplification of rotational congestion is achieved by rotationally cooling the seeded gas sample in a pulsed supersonic jet expansion. The rotationally resolved one-photon ionization spectrum of NO can be compared with a recent theoretical treatment on the competition between photoionization and photodissociation processes in the $np\pi$ Rydberg states above the first ionization $potential.^{1}$ Several new features in the spectrum are also observed, and the $ns\sigma(\nu=2)$ series is extended by two new members.
Description
$^{1}$A. Giusti-Suzor and Ch. Jungen, J. Chem. Phys., 80, 986 (1984).
Author Institution: Dept. of Chemistry, Yale University
Author Institution: Dept. of Chemistry, Yale University