Design and performance evaluation of a miniaturized particle desorption mass spectrometer Academic Article uri icon

abstract

  • A miniaturized particle desorption mass spectrometer PDMS has been designed, assembled and tested. A theoretical model has been used to analyze the transmission efficiency and to predict the mass resolution performance. The setup consisted of (a) a 50 μCi 252Cf source placed behind a thin target (transmission mode), (b) a 15 cm flight tube of 2 cm diameter and (c) microchannel plate start and stop detectors. The detector signals were processed via constant fraction discriminators through a time-to-amplitude converter and stored in a multichannel analyzer. Mass resolution was dependent upon both mass and sample bias. For a mass of 133 amu and sample bias of 1 kV, the mass resolution ( m Δm) was 130. Desorbed ions were focused by means of an electrostatic particle guide. The effect of the initial ion energy and angular distributions on the optical transmission efficiency of this guide has been analyzed. The overall instrument transmission efficiency was approximately 40%. The detection limit for Li has been estimated at 0.5 μmol. The applicability of PDMS to environmental samples was demonstrated with the analysis of pesticides. © 1988.

author list (cited authors)

  • Davis, K. V., Da Silveira, E. F., & Schweikert, E. A.

citation count

  • 4

publication date

  • December 1988