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A Compact UHV Tandem Quadrupole Mass Spectrometer for Surface‐Induced Dissociation Studies Using Well‐Characterized Surfaces

1998; Wiley; Volume: 38; Issue: 4 Linguagem: Inglês

10.1002/ijch.199800043

1869-5868

Steven L. Bernasek, Frederick D.S. Park, Lynn M. Phelan, Mark Hayward,

Analytical chemistry methods development

Abstract Collision of low‐energy polyatomic ions with surfaces can be an effective method for ion activation and fragmentation for ion structural analysis. In order for this method to be more widely used, a better understanding of low‐energy ion‐surface reactions must be obtained. The design and construction of a compact tandem quadrupole mass spectrometer which can be used to investigate low‐energy ion‐surface reactions on well‐characterized surfaces is described. This UHV‐compatible instrument is designed to fit entirely on a standard eight‐inch UHV flange, and so can be easily mounted on a typical UHV electron spectroscopy system for preparing and characterizing the scattering surface. The operation of this instrument is illustrated by the discussion of two examples: the first, the associative reaction between benzene ions and a hydrocarbon surface to form C 7 H 7 + via a sputtered‐ion mechanism; the second, an examination of the effect of organic monolayer structure on the reactivity of the monolayer for protonation of incident benzene ions.