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. doi:10.1063/1.451140. https://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.
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| 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. | ||||||
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| Subject Keywords: | INFRARED SPECTRA, HYDRONIUM RADICALS, OXONIUM IONS, MOLECULAR IONS, ADDUCTS, MOLECULAR CLUSTERS, HYDRONIUM RADICALS | ||||||
| Issue or Number: | 4 | ||||||
| DOI: | 10.1063/1.451140 | ||||||
| Record Number: | CaltechAUTHORS:OKUjcp86a | ||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:OKUjcp86a | ||||||
| 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: | 08 Nov 2021 21:06 |
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