Abstract
European Journal of Mass Spectrometry
Volume 15 Issue 4, Pages 445–458 (2009)
doi: 10.1255/ejms.998
The effects of entrance fields on the performance of quadrupole mass spectrometers
A E. Banner
8 Cranmere Drive, Sale, Cheshire M33 4LB, UK. E-mail: aebanner@hotmail.co.uk
The theoretical performance of quadrupole mass spectrometers has been studied by means of a new computer model, with particular reference to three-dimensional ion trajectories, both within the main filter and the entrance fields, including the effects of z-energy changes in the latter. It is shown that considerable improvements in acceptance area can be obtained by suitable modification of the entrance fields.
Keywords: quadrupole, mass spectrometer, prefilter, filter, entrance field, trajectories, acceptance area, entrance aperture
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