✦ LIBER ✦

Sublimation versus fragmentation in matrix-assisted laser desorption

✍ Scribed by A. Vertes; R.D. Levine

Publisher: Elsevier Science
Year: 1990
Tongue: English
Weight: 649 KB
Volume: 171
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(90)85365-j

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✦ Synopsis

A kinematic model for the laser-induced introduction into the gas phase of large molecules emhedded in a host matrix is discussed. The deaorption of undcgraded large molecules is argued to bc a kinetic effect due to potentially rapid destruction of the host matrix. Two separate mechanisms are considered, sublimation and fragmentation of the matrix. Due to the choice of hosts, sublimation is more typical of experiments using UV laser pulses. In general, sublimation is found to be more efficient because it can turn itself off. The matrix destruction competes with host-guest vibrational energy transfer. The energy content of the guest can bc reduced by working at low volume concentrations, special choice of host matrices and using an initially cold sample.

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