Surface ionization molecular beam detector with a magnetic mass filter: application to absolute differential reactive cross section measurements

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Abstract
A magnetic mass filter of the half-period Wien filter type is described. Formulae and graphs necessary for the design of half-period filters are given and several important aspects of the design are described in detail. The design of a molecular beam detector, incorporating a half-period filter, is discussed. In this application, the small, straight line magnet is advantageous. Many important independent requirements are fulfilled simultaneously by the relatively simple design, which utilizes the mass 'discrimination' in the ion source for good mass suppression despite the use of high transmission and low resolution.