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Laser-induced fluorescence study of the hydrogen atom formation dynamics in the 248 nm gas-phase photodissociation of vibrational state selected water (H2O (|04−〉))

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The vibrationally-mediated H2O gas-phase photodissociation was studied at a photolysis wavelength of 248 nm. Single rotational states of the |03−〉|2〉 and |04−〉 H2O overtone vibrations were prepared by laser photoexcitation around 720 nm. H atoms formed in the photodissociation of the H2O (|04−〉J′KaKc = 313) were detected by Lyman-α laser-induced fluorescence spectroscopy with sub-Doppler resolution to determine their translational energy. The present result confirms that in the dissociation process the major part (ca. 93%) of the available energy is released as relative translational energy of the nascent H + OH photofragments, in agreement with earlier complementary measurements (R. L. Vander Wal, J. L. Scott and F. F. Crim, J. Chem. Phys. 94, 1859 (1991)), where the internal excitation of the OH product radical was investigated at different photolysis wavelengths.

Affiliations: 1: Physikalisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany; 2: Radiation Chemistry and Chemical Dynamics Division, Bhabha Atomic Research Centre, Mumbai 400-085, India; 3: Physikalisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 253, D-69120 Heidelberg, Germany; Radiation Chemistry and Chemical Dynamics Division, Bhabha Atomic Research Centre, Mumbai 400-085, India

10.1163/156856707782565796
/content/journals/10.1163/156856707782565796
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/content/journals/10.1163/156856707782565796
2007-06-01
2016-12-09

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