METHOD OF SEPARATING AND DETECTING IONS IN GAS Russian patent published in 2012 - IPC G01N27/62 

FIELD: chemistry.

SUBSTANCE: ions of substances are separated through superposition of alternating-sign periodic polarity-asymmetrical and unidirectional electric fields in a gas stream bounded by elongated electrodes and having temperature which depends on the ambient temperature. The unidirectional electric field is varied and the spectrum of separated ions is recorded in form of a set of ion peaks. First, the amplitude and parameter which characterises the mean-square deviation are determined at given gas temperature for the peak of ions of the calibration substance of known concentration. By selecting the amplitude of the polarity-asymmetrical electric field and the gas flow rate, the balance between the amplitude of the peak and the inverse value of the parameter is set. When changing gas temperature during operation to maintain balance, the gas flow rate is changed.

EFFECT: possibility of increasing stability of analytical characteristics with variation of operating ambient temperature in a wide range.

5 cl, 4 dwg