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Issue 13, 2001
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Electron stimulated desorption of O and O2 from condensed ozone: Possible implications for the heterogeneous photochemistry of stratospheric O3

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Abstract

We have studied the desorption of negative ions following low energy electron impact (0–15 eV) to ozone condensed in multilayer amounts on a cryogenically cooled gold surface. Intense desorption of O is observed at low electron energies (below 4 eV) [italic v (to differentiate from Times ital nu)]ia pronounced resonances with an estimated desorption cross section of the order of 10−18 cm2 (peak value). The resonant features in the ion yield indicate that O desorption is driven by dissociative electron attachment to O3 molecules at or near the surface. While dissociative electron attachment (DA) from gas phase ozone generates the fragment ions O and O2 at comparable intensities, desorption of O2 from condensed ozone is strongly suppressed, being only weakly observed within a resonance located at 7 eV. Possible implications for the heterogeneous chemistry of ozone on polar stratospheric cloud (PSC) particles, namely photo-induced dissociative electron transfer from the substrate, are discussed in the light of the effective O desorption observed at low electron energies.

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Article information


Submitted
02 Feb 2001
Accepted
25 Apr 2001
First published
31 May 2001

Phys. Chem. Chem. Phys., 2001,3, 2625-2629
Article type
Paper

Electron stimulated desorption of O and O2 from condensed ozone: Possible implications for the heterogeneous photochemistry of stratospheric O3

P. Tegeder, P. A. Kendall, M. Penno, N. J. Mason and E. Illenberger, Phys. Chem. Chem. Phys., 2001, 3, 2625
DOI: 10.1039/B101137P

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