The lifetimes for spontaneous emission from the X 3Sigma−(v=1) and a 1Delta states of CH−
- Creators
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Okumura, M.
- Yeh, L. I.
- Normand, D.
- Lee, Y. T.
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.
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.Attached Files
Published - OKUjcp86a.pdf
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Additional details
- Eprint ID
- 10225
- Resolver ID
- CaltechAUTHORS:OKUjcp86a
- Department of Energy (DOE)
- DE-AC03-76SF00098
- NSF Predoctoral Fellowship
- Created
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2008-04-17Created from EPrint's datestamp field
- Updated
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2021-11-08Created from EPrint's last_modified field