OPTIMIZATION OF A COMMERCIAL QUADRUPOLE MASS-SPECTROMETER FOR TIME-OF-FLIGHT MEASUREMENTS OF LASER-DESORPTION

被引:16
|
作者
BRAUN, R [1 ]
HESS, P [1 ]
机构
[1] UNIV HEIDELBERG,INST PHYS CHEM,NEUENHEIMER FELD 253,W-6900 HEIDELBERG,GERMANY
关键词
QUADRUPOLE MASS SPECTROMETER; TIME OF FLIGHT; LASER DESORPTION; VAN-DER-WAALS FILM; NON-MAXWELLIAN DISTRIBUTION;
D O I
10.1016/0168-1176(93)80045-G
中图分类号
O64 [物理化学(理论化学)、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号
070203 ; 070304 ; 081704 ; 1406 ;
摘要
Quadrupole mass analyzers (QMAs) are receiving increasing attention for applications in time-of-flight (TOF) studies of laser-induced desorption, ablation and surface reactions in order to extend the information attainable from these experiments. With such a complicated detection device, however, it is easily possible to inadvertantly manipulate the real time-of-flight distribution, for example by missing fast or slow particles. In this work a systematic investigation of the influence of the different QMA parameters on the signal and their interplay was undertaken in laser-induced desorption experiments. The particle pulses were generated by resonant vibrational excitation of condensed benzene films with a TEA CO2 laser. Our investigations give the optimized configuration and setting of potentials for the instrument studied, in terms of sensitivity and energy resolution, and an accurate procedure to determine the drift time of ions in the quadrupole. This makes it possible to detect undistorted time-of-flight distributions with a time resolution of about 5 mus for a range of incident kinetic energies of at least 0-3 eV.
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页码:229 / 239
页数:11
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