Photodissociation of condensed carbon dioxide below the gas phase thresholds

We have investigated photodesorption from condensed carbon dioxide for photon energies ranging from 13 to 35 eV using synchrotron radiation. We report the desorption of O 2 + ions at energies as low as 13 eV, and discuss this behaviour in terms of ion–molecule reactions. The desorbed CO + ion yield...

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Bibliographic Details
Published in:Chemical physics letters 1998-05, Vol.287 (5), p.742-746
Main Authors: Coquel, J.M., Siller, L., Wilkes, J., Carrapa, R., Lamont, C.L.A., Almeida Gasche, T., Palmer, R.E., Moutinho, A.M.C.
Format: Article
Language:English
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Summary:We have investigated photodesorption from condensed carbon dioxide for photon energies ranging from 13 to 35 eV using synchrotron radiation. We report the desorption of O 2 + ions at energies as low as 13 eV, and discuss this behaviour in terms of ion–molecule reactions. The desorbed CO + ion yield shows resonances at ∼15.4 and ∼17 eV, below the gas-phase thermodynamic threshold for CO + formation. These peaks are also assigned to a two-step process, in which the photodissociation of CO 2 leads to neutral CO production.
ISSN:0009-2614
1873-4448
DOI:10.1016/S0009-2614(98)00219-X