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APS » Journals » Phys. Rev. B » Volume 66 » Issue 23
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Phys. Rev. B 66, 233405 (2002) [4 pages]

Surface photochemistry induced by ultrafast pulses of vacuum ultraviolet light: Physisorbed oxygen on graphite

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D. Riedel*, L. M. A. Perdigão, J. L. Hernández-Pozos†, Q. Guo, and R. E. Palmer‡
Nanoscale Physics Research Laboratory, School of Physics and Astronomy, The University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom

J. S. Foord
Physical and Theoretical Chemistry Laboratory, The University of Oxford, South Parks Road, Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom

K. W. Kolasinski§
School of Chemistry, The University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom

Received 24 September 2002; published 17 December 2002

We report a surface photochemistry study using ultrafast pulses of vacuum ultraviolet (vuv) light for excitation. Tunable vuv radiation (10–38 eV) is produced via high harmonic generation. We have studied the model system of physisorbed O2 on graphite. The only observed desorption product is O+, the yield of which is measured as a function of the excitation photon energy. The kinetic energies of the desorbed ions are obtained by time-of-flight measurements with the pulsed source. These measurements enable us to suggest that the O+ desorption proceeds through more than one channel and to identify the electronic transitions that may be involved in the dissociative ionization of the physisorbed O2.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.66.233405
DOI:
10.1103/PhysRevB.66.233405
PACS:
82.50.Hp, 33.80.Gj, 78.47.+p, 79.20.La

*Current address: Laboratoire de Photophysique Moléculaire, Université Paris Sud 91405 Orsay, France.

†Current address: Laboratorio de Optica Cuantica, Depto de Fisica, Universidad Autonoma Metropolitana-Iztapalapa, Apdo. Postal 55 534, Mexico D.F, Mexico.

‡Corresponding author: R.E.Palmer@bham.ac.uk

§Current address: Department of Chemistry, Queen Mary, University of London, Mile End Road, London E1 4NS, U.K.

 
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