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The lifetimes for spontaneous emission from the X 3Sigma−(v=1) and a 1Delta states of CH−

Okumura, M. and Yeh, L. I. and Normand, D. and Lee, Y. T. (1986) The lifetimes for spontaneous emission from the X 3Sigma−(v=1) and a 1Delta states of CH−. Journal of Chemical Physics, 85 (4). pp. 1971-1976. ISSN 0021-9606. http://resolver.caltech.edu/CaltechAUTHORS:OKUjcp86a

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Abstract

The radiative decay of excited CH− trapped in a radio frequency ion trap was measured, and the total excited state population was probed by observing the depletion of trapped CH− caused by photodetachment at 1.16 eV, below the expected electron affinity for the ground 3Sigma− state. The signal decayed biexponentially with time. We assigned the long lived state (lifetime 5.9+0.8, −0.6 s) as the metastable a 1Delta state previously identified in the photoelectron spectrum. The fast decay, with a lifetime of 1.75±0.15 ms, was attributed to the first excited vibrational level of the ground 3Sigma− state, in good agreement with a theoretical result by Manz, Zilch, Rosmus, and Werner. These results support the electron affinity of 1.238 eV for CH− obtained by Kasdan, Herbst, and Lineberger from photoelectron spectroscopy, and contradict the value of 0.74 eV determined by Feldmann from photodetachment spectroscopy.


Item Type:Article
Additional Information:Copyright © 1986 American Institute of Physics. Received 14 April 1986; accepted 5 May 1986. We thank P. Rosmus for sending us a preprint. This work was supported by the Director, Office of Energy Research, Office of Basic Energy Sciences, Chemical Sciences Division of the U.S. Department of Energy under Contract No. DE-AC03-76SF00098. [L.I.Y. was an] NSF Pre-Doctoral Fellow.
Subject Keywords:INFRARED SPECTRA, HYDRONIUM RADICALS, OXONIUM IONS, MOLECULAR IONS, ADDUCTS, MOLECULAR CLUSTERS, HYDRONIUM RADICALS
Record Number:CaltechAUTHORS:OKUjcp86a
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:OKUjcp86a
Alternative URL:http://dx.doi.org/10.1063/1.451140
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10225
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:17 Apr 2008
Last Modified:26 Dec 2012 09:58

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