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Instability of desorption mode in laser-stimulated desorption

✍ Scribed by B. Fain; A. Boeglin; S.H. Lin

Publisher
Elsevier Science
Year
1986
Weight
890 KB
Volume
142
Category
Article
ISSN
0378-4363

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✦ Synopsis

A theoretical model of IR laser-induced desorption is developed. An analysis of experimental data shows that this desorption may have a collective character. Such collective character may be the result of so-called resonant or indirect heating. It is shown that this mechanism is not a very efficient one. A new mechanism of laser-induced desorption is proposed. An internal vibration of the adsorbate is excited by laser and its energy is transferred to the desorption mode -an adsorbate-surface bond. This mode coupling with surface phonons becomes unstable. Such instabiliby leads to rupture of the adsorbate-surface bond.

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