Table of Contents
Laser Chemistry
Volume 18, Issue 4, Pages 219-237
http://dx.doi.org/10.1155/2000/13792

Laser Desorption Dynamics of Carbendazim on a Glass Surface

Unidad de Láseres y Haces Moleculares, Instituto Pluridisciplinar, Universidad Complutense de Madrid, Juan XXIII-1, Madrid 28040, Spain

Received 1 May 2000

Copyright © 2000 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A study on the desorption of carbendazim (methyl-2-benzimidazolecarbamate, mass = 191 amu) from a glass surface (Pyrex) has been carried out using an experimental set-up based on laser desorption and laser post-ionization followed by time-of-flight mass spectrometry. After optimization of the experimental conditions a resolution of ca. 850 was achieved at the mass of the pesticide (191 amu). All measured time-of-flight mass spectra showed not only an excellent signal to noise ratio, but also the lack of significant molecular fragmentation, except for a mass of 71 amu which was attributed to the lateral chain of the carbendazim. Neutral time-of-flight yields were measured for several desorption energies. Analysis of the corresponding velocity distributions suggests a thermal mechanism dominating the laser-induced desorption. Finally the capability of the present technique for analytical applications is also discussed.