Dynamics of alkali-metal atom photodesorption from polymer thin films
Journal Article
·
· Physical Review. A
- Fysisk Institut, Syddansk Universitet, DK-5230 Odense M (Denmark)
- Natural Sciences Center, A.M. Prokhorov General Physics Institute, Russian Academy of Sciences, 119991 Moscow (Russian Federation)
- Marian Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 (Poland)
Kinetic energy distributions of alkali-metal atoms (sodium and rubidium) desorbed from poly-dimethylsiloxane coated glasses via visible (532 nm) and near-infrared (1064 nm) laser irradiation are determined. In each case the time-of-flight spectra show a single desorption peak. In the case of sodium the mean kinetic energy of the desorbing atoms depends on the photon energy and linearly on the laser fluence. Evanescent-wave desorption measurements show that the origin of the desorbed atoms is within the bulk of the thin organic film. The results are discussed in terms of electronic excitation and resonant heating, providing values of barrier heights for desorption from PDMS. The observed small barrier heights explain the weak light intensity necessary for light-induced atomic desorption from such systems.
- OSTI ID:
- 20643774
- Journal Information:
- Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 69; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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