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VUV photochemistry of oriented molecules: methylchloride on highly oriented pyrolytic graphite |
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| Authors: | J Wilkes C L A Lamont L Sì ller J M Coquel and R E Palmer |
| Institution: | a Department of Chemical and Biological Sciences, University of Huddersfield, Queensgate, Huddersfield, HD1 3DH, UK b Nanoscale Physics Research Laboratory, School of Physics and Space Research, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK |
| Abstract: | The photoionization of CH3Cl adsorbed on highly oriented pyrolytic graphite has been investigated as a function of the photon energy in the range 13–35 eV. Two ions were detected — CH+3 and H+ — which show differences in their coverage and energy dependences. At very low coverages only H+ ions are produced, while at higher coverages (still in the monolayer regime) CH+3 ions are also observed, reflecting a change in the orientation of the molecule on the surface as a function of coverage. The cross-section curves as a function of the photon energy for both ions show a maximum at 22 eV, while the onsets are at 16 eV for CH+3 and 19 eV for H+. |
| Keywords: | Graphite Halohydrocarbons Methylchloride Photon stimulated desorption Surface phase transitions Surface photochemistry |
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