Photoemissive ion mobility spectrometry in ambient air

Details Photoemissive ion mobility spectrometry in ambient air Photoemissive ion mobility spectrometry in ambient air

2007-12-04

2007-12-04

Berman, Jack I. (Department: 2881)

Radiant energy

Ionic separation or analysis

Ion beam pulsing means with detector synchronizing means

C250S288000, C250S42300F

Reexamination Certificate

active

11491508

ABSTRACT:
A photoemissive ion mobility spectrometer is disclosed for of chlorinated hydrocarbons and nitro-organic materials. Backside illumination of a thin gold film by pulsed laser radiation, pulsed ultraviolet xenon flashlamp, or like UV source, is used to produce bursts of low energy photo-emitted electrons. These swarms of thermalized electrons are directly attached by electronegative analytes or by reactant molecules, followed by charge transfer to the more electronegative analyte. Total internal reflection is incorporated for the backside illumination using optical elements such as a fused silica prism. The spectrometer allows for the direct vaporization of adsorbed explosive molecules from surfaces followed by direct injection into the photoemissive ion mobility spectrometer through a heated inlet.

REFERENCES:
patent: 3514658 (1970-05-01), Davis et al.
patent: 3902064 (1975-08-01), Young
patent: 4837441 (1989-06-01), Hurrell

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