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Measurement of time-of-flight distributions for wavelength-dependent IR laser-stimulated desorption

✍ Scribed by B. Schàfer; P. Hess

Publisher
Elsevier Science
Year
1984
Tongue
English
Weight
403 KB
Volume
105
Category
Article
ISSN
0009-2614

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✦ Synopsis

The wavclcngth dependence of CC14 dcsorptmn from muMayers condensed on a Gc substrate is investigated. The strong spectral selectivity of the desorption yield and of the temperatures determined from the rime-of-fli_eht distnbutions coincides with the linear infrared absorption spectrum l.Introduction user-st~ulated d~sorption of polyato~c molecules by resonant vibrational excitation of internal modes wrth an rnfrared laser has found considerable interest recently. A dependence of the desorption yield on laser wavelength has been demonstrated for submonolayer and multilayer coverage of CH,F on NaCl [I], pyridine on KC1 [2], pyndine on Ag [3], and pyridine on a silver island film, prepared in situ on a fused quartz substrate [4] _ This laser-stimulated process caused by resonant adsorbate excitation often is called "'resonant desorption" and is distinguished from "thermal desorptron" induced, for example, by laser heating of the adsorbent [5] _ Until now. the time-of-flight method has been

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