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LASER-ABLATION OF ORGANIC-MOLECULES FROM FROZEN MATRICES
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UNSPECIFIED (1995) LASER-ABLATION OF ORGANIC-MOLECULES FROM FROZEN MATRICES. In: 21st British-Mass-Spectrometry-Society Three-day Meeting, UNIV MANCHESTER, INST SCI & TECHNOL, MANCHESTER, ENGLAND, SEP 03-06, 1995. Published in: RAPID COMMUNICATIONS IN MASS SPECTROMETRY, 9 (14). pp. 1431-1436. ISSN 0951-4198.
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Abstract
The technique of frozen matrix-assisted laser ablation coupled with resonance-enhanced multiphoton ionization and reflectron time-of-flight mass spectrometry was used to detect intact organic molecules directly from solutions. When frozen at the temperature of liquid nitrogen, the matrices of interest were ablated by a pulsed CO2 single-mode laser. The analyte molecules emerging from the ablated plume were then ionized by a tunable XeCl excimer laser-pumped dye laser and analysed with a gridless reflectron time-of-flight mass spectrometer. The ablation process from an ice matrix was studied with the amino acids tryptophan and tyrosine dissolved in an aqueous ethanol solution to a concentration level of 5 x 10(-4) M. It was found that fragmentation of the analyte molecules is strongly dependent on the ablating laser fluence and that there is a laser fluence range just above the ablation threshold where the decomposition is negligible. The different fragmentation mechanisms are discussed and a cavitation under the liquid surface, causing the sonoluminescence signal from an ice matrix, was shown to be responsible for the decomposition of the analyte molecules ablated by a low photon energy IR laser. Under the appropriate conditions, the analyte molecules were found to have a low rotational temperature of about 150 K resulting from the jet-like cooling in multiple collisions with matrix molecules.
Item Type: | Conference Item (UNSPECIFIED) | ||||
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Subjects: | Q Science > QD Chemistry Q Science > QC Physics |
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Journal or Publication Title: | RAPID COMMUNICATIONS IN MASS SPECTROMETRY | ||||
Publisher: | JOHN WILEY & SONS LTD | ||||
ISSN: | 0951-4198 | ||||
Official Date: | 1995 | ||||
Dates: |
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Volume: | 9 | ||||
Number: | 14 | ||||
Number of Pages: | 6 | ||||
Page Range: | pp. 1431-1436 | ||||
Publication Status: | Published | ||||
Title of Event: | 21st British-Mass-Spectrometry-Society Three-day Meeting | ||||
Location of Event: | UNIV MANCHESTER, INST SCI & TECHNOL, MANCHESTER, ENGLAND | ||||
Date(s) of Event: | SEP 03-06, 1995 |
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