title: A new method for electrostatic ion deflection.
abstract: A new approach to electrostatic ion deflection is described where an electrostatic particle guide (EPG) operating with reversed polarity is used to deflect ions in a cylindrical geometry about the axis of a time-of-flight mass spectrometer. The method has advantages over the standard parallel-plate deflector geometry in that it is more effective in deflecting ion beams that have a significant radial velocity component. The device is being used in (252)cs Cf plasma desorption mass spectrometry ((252)cs Cf -PDMS) experiments in an on/off mode to record neutral particle spectra and in a synchronized pulsed mode to reduce the magnitude of the uncorrelated background in the time-of-flight spectrum. Radial distribution functions have been measured for various EPG voltages. Its use as a background suppression technique is demonstrated by using the (252)cs Cf-PDMS spectrum of insulin. (28-36).
authors.affiliation: Department of Chemistry, Texas A&M University, 77843, College Station, TX.
authors.forename: B
authors.initials: B
authors.lastname: Wolf
authors.forename: P D
authors.initials: PD
authors.lastname: Mudgett
authors.forename: R D
authors.initials: RD
authors.lastname: Macfarlane