FIELD: optics.
SUBSTANCE: invention relates to optics and analytical equipment and can be used to determine presence of trace amounts of volatile substances. Method of detecting trace amounts of substances in a gaseous medium which cause surface optical sensitization of halogen silver under the action of light in a three-layer thin film structure, having a mirror silver layer, a protective layer and a silver halogenide layer, by changing the shape of the curve of the reflection coefficient of the incident radiation from the angle of incidence, it differs from known designs in that, simultaneously with illumination of molecules with light with radiation frequency coinciding with absorption line and causing surface optical sensitization, a constant electric field parallel to the film plane is switched on.
EFFECT: high sensitivity of detecting trace amounts of substances in a gaseous medium.
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