Ion mobility spectrometer

Details Ion mobility spectrometer Ion mobility spectrometer

1986-09-18

1987-12-08

Church, Craig E.

Radiant energy

Ionic separation or analysis

Ion beam pulsing means with detector synchronizing means

250288, 7386481, H01J 4940

Patent

active

047120088

ABSTRACT:
An ion mobility spectrometer is described for detecting gas constituents in an ambient air incorporating a cylindrical tube containing a reaction region, a shutter assembly and a drift region therein, the cylindrical tube fits within a housing having a chamber or space between the cylindrical tube and the housing for heating drift gas prior to entry into the drift region. Further, the cylindrical tube may have interior annular ledges to facilitate positioning of the shutter assembly and an aperture grid. The invention overcomes the problem of controlling the temperature of the drift gas prior to entry into the drift region to enhance the uniformity of ion drift mobility times and the problem of a mechanical assembly which is difficult to dissemble.

REFERENCES:
patent: 3697748 (1972-10-01), Cohen
patent: 4311669 (1982-01-01), Spangler
patent: 4378499 (1983-03-01), Spangler et al.
patent: 4390784 (1983-06-01), Browning et al.
patent: 4445038 (1984-04-01), Spangler et al.
G. E. Spangler et al., "Optimization of a Miniaturized Ion Mobility Spectrometer Cell" 1984 Abstracts, The Pittsburgh Conf. and Exposition on Analytical Chem. and Applied Spectroscopy, Atlantic City, N.J., USA, Mar. 5-9, 1984.

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