Abstract
The photoionization of CH 3Cl 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 +.
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