Rydberg states near the ionization continuum: Autoionization in ammonia

Previously undetected autoionizing Rydberg levels of ammonia which exist in the energy region between the first ionization continuum and the first excited vibrational level of the NH+3 ion have been measured. Jet cooled ammonia molecules in high lying Rydberg levels were detected by a two-color, thr...

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Bibliographic Details
Published in:The Journal of chemical physics 1994-10, Vol.101 (8), p.6523-6528
Main Authors: Cramb, D. T., Wallace, S. C.
Format: Article
Language:English
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Summary:Previously undetected autoionizing Rydberg levels of ammonia which exist in the energy region between the first ionization continuum and the first excited vibrational level of the NH+3 ion have been measured. Jet cooled ammonia molecules in high lying Rydberg levels were detected by a two-color, three-photon excitation resonantly enhanced multiphoton ionization process, 2+1′. The Rydberg series can be assigned to a continuation of the (a2″)(nsa1′) series to which the Ã, D̃′, and Ẽ″ states belong. A vibronic autoionization mechanism based on the electrostatic and linear terms [V0 and (∂V/∂Q)Q, respectively] in the potential energy expansion has been suggested.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.468346