Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Patent
1989-03-21
1991-11-05
Niebling, John F.
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
20415761, 250425, 2504921, G01N 2762, B23K 2600
Patent
active
050629352
ABSTRACT:
When vaporizing a sample substance consisting of big molecules, in particular for the purpose of mass-spectroscopic examinations, the energy introduced for the vaporization process may lead to thermolytic decomposition of the sample substance. In order to prevent such decomposition, the invention proposes that the sample substance be mixed, prior to its irradiation, with a matrix material which is easily decomposed under the influence of the laser beam pulses. The matrix may consist of a material which absorbs the radiation and which is easily decomposed thermolytically, or else of a material which is permeable to laser radiation, but mixed with a metal powder. When the mixture is exposed to laser beam pulses, the instable matrix material will decompose first whereby the embedded molecules of the sample substance are set free. It is possible in this manner to prevent, practically completely, the molecules of the sample substance from being destructed. Suitable compounds for use as matrix material are, in particular, sugar, cellulose and NH.sub.4 NO.sub.3 as well as polyethylene, with an admixture of gold or silver powder.
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Beavis Ronald C.
Grotemeyer Jurgen
Lindner Josef
Schlag Edward W.
Bruker-Franzen Analytik GmbH
Hsing Ben C.
Niebling John F.
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