Elsevier

Chemical Physics

Volume 134, Issues 2–3, 1 July 1989, Pages 375-384
Chemical Physics

Multiphoton electron detachment studies of C7H7 using a low-power infrared laser. Competition of radiative and collisional relaxation with vibrational excitation

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Abstract

Infrared laser-induced electron detachment from C6H5CH2, C6D5CH2 and cyclo-C7H7 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 CO2 laser. Electron detachment is monitored as a function of irradiation period, laser intensity, wave-length and neutral gas pressure. Infrared photodetachment spectra of C6H5CH2 and C6D5CH2 exhibit bands at 945 and 932 cm−1, respectively, while the spectrum of cyclo-C7H7 shows only slight dependence on laser frequency between 920 and 1080 cm−1. Modeling of the C6H5CH2 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.

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    Contribution No. 6552.

    1

    Present address: Department of Chemistry, University of Utah, Salt Lake City, UT 84112, USA.

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