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Proceedings Paper

Laser Transfer Of Organic Adsorbates: A Test Case Using Coronene Surface Patterns Transferred With Micrometer Resolution To IR Windows
Author(s): M. DeVries; H Hunziker; H. R Wendt; D. D. Saperstein
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Paper Abstract

It has been shown that molecules can be removed intact from surfaces by laser induced thermal desorption.(1) We show that this process can he used to transfer organic surface deposits across a vacuum gap to a transparent window such as NaCI for subsequent analysis by Fourier transform infrared spectrometry (PTIR). Experiments with thin film test patterns have revealed that a high degree of lateral resolution can be maintained in the transfer process. We attribute this to a strongly forward-peaked distribution of desorbed material. When the desorption wavelength is chosen such that the light is absorbed mainly by the substrate, a suitable power can be found to transfer all of the surface-deposited coronene to the transparent window. For example, rectangular spots of coronene can be transferred from a polished stainless steel surface, using 1.064 urn radiation, with no more than a 10 mrad spread of the pattern and with almost no loss of material.

Paper Details

Date Published: 1 December 1989
PDF: 2 pages
Proc. SPIE 1145, 7th Intl Conf on Fourier Transform Spectroscopy, (1 December 1989); doi: 10.1117/12.969477
Show Author Affiliations
M. DeVries, IBM Research Division (United States)
H Hunziker, IBM Research Division (United States)
H. R Wendt, IBM Research Division (United States)
D. D. Saperstein, IBM General Products Division (United States)

Published in SPIE Proceedings Vol. 1145:
7th Intl Conf on Fourier Transform Spectroscopy
David G. Cameron, Editor(s)

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