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Multiphoton electron detachment studies of C_7H_7− using a low-power infrared laser. Competition of radiative and collisional relaxation with vibrational excitation

Wight, Charles A. and Beauchamp, J. L. (1989) Multiphoton electron detachment studies of C_7H_7− using a low-power infrared laser. Competition of radiative and collisional relaxation with vibrational excitation. Chemical Physics, 134 (2-3). pp. 375-384. ISSN 0301-0104 . http://resolver.caltech.edu/CaltechAUTHORS:20180702-135127172

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Abstract

Infrared laser-induced electron detachment from C_6H_5CH_2−, C_6D_5CH_2− and cyclo-C_7H_7− has been investigated by ion cyclotron resonance spectroscopy. Anions are trapped at low pressure for up to several seconds and are uniformly irradiated with the unfocused output of a cw CO_2 laser. Electron detachment is monitored as a function of irradiation period, laser intensity, wave-length and neutral gas pressure. Infrared photodetachment spectra of C_6H_5CH_2− and C_6D_5CH_2− exhibit bands at 945 and 932 cm^(−1), respectively, while the spectrum of cyclo-C_7H_7− shows only slight dependence on laser frequency between 920 and 1080 cm^(−1). Modeling of the C_6H_5CH_2− photodetachment kinetics suggests that one step in the laser excitation process is rate limiting. Radiative relaxation does not appear to be significant at laser intensities greater than 10 W cm^(−2) and collisions with neutral molecules are only moderately effective in deactivating vibrationally excited anions.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/0301-0104(89)87169-1DOIArticle
ORCID:
AuthorORCID
Beauchamp, J. L.0000-0001-8839-4822
Alternate Title:Multiphoton electron detachment studies of C7H7− using a low-power infrared laser. Competition of radiative and collisional relaxation with vibrational excitation
Additional Information:© 1989 Published by Elsevier B.V. Received 4 November 1981. This work was supported in part by the President’s Fund of the California Institute of Technology and US Department of Energy.
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Funding AgencyGrant Number
Caltech President’s FundUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Record Number:CaltechAUTHORS:20180702-135127172
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180702-135127172
Official Citation:Charles A. Wight, J.L. Beauchamp, Multiphoton electron detachment studies of C7H7− using a low-power infrared laser. Competition of radiative and collisional relaxation with vibrational excitation, Chemical Physics, Volume 134, Issues 2–3, 1989, Pages 375-384, ISSN 0301-0104, https://doi.org/10.1016/0301-0104(89)87169-1. (http://www.sciencedirect.com/science/article/pii/0301010489871691)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87525
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:03 Jul 2018 18:02
Last Modified:03 Jul 2018 18:02

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