Accession Number : ADA119635

Title :   Investigation of Mechanisms in Field-Desorbed Ion Formation Using a Pulsed Field Desorption Time-of-Flight Mass Spectrometer.

Descriptive Note : Final technical rept. 15 Aug 78-19 Nov 81,

Corporate Author : SRI INTERNATIONAL MENLO PARK CA

Personal Author(s) : Buttrill,S E , Jr

PDF Url : ADA119635

Report Date : Aug 1982

Pagination or Media Count : 44

Abstract : A pulsed field desorption time-of-flight mass spectrometer was designed and tested. Second-order energy focusing was achieved using a two-stage electrostatic reflector. Ions were formed by applying a 80-150 ns negative pulse of 2200 volts to a counter electrode spaced 50-200 micrometers away from either silicon or carbon activated emitters. The interaction of the high voltage pulse with the ion packet caused a large spread in the ion energy and limited mass resolution to only 400 at m/z 152. In separate experiments using a pulsed laser to produce ions, a time resolution of 1450 was obtained at m/z 242. (Author)

Descriptors :   *Mass spectra, *Desorption, *Ions, *Pulsed lasers, Mass spectrometers, Time, Flight, Ionization, Field conditions, Ion beams

Subject Categories : Lasers and Masers
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE