Abstract: A method for mass-spectrometric detection of compounds in a gas flow includes: alternatingly forming first and a second beams by switching between electron pulses/pulse trains and photon pulses/pulse trains, the photon pulses/pulse trains being generated by an excimer lamp, and the switching between the electron pulses/pulse trains and the photon pulses/pulse trains occurring at a switching frequency above 50 Hz; disposing the gas flow in an ionization region crossed by the first and second beams so as to ionize volume units in the gas flow so as to form ions of the compounds; deflecting the ions in an effective region of an electric field to a mass-spectrometric device; and sensing the ions with a mass-spectrometric process of the mass-spectrometric device.

Abstract: A method for mass-spectrometric detection of compounds in a gas flow includes: alternatingly forming first and a second beams by switching between electron pulses/pulse trains and photon pulses/pulse trains, the photon pulses/pulse trains being generated by an excimer lamp, and the switching between the electron pulses/pulse trains and the photon pulses/pulse trains occurring at a switching frequency above 50 Hz; disposing the gas flow in an ionization region crossed by the first and second beams so as to ionize volume units in the gas flow so as to form ions of the compounds; deflecting the ions in an effective region of an electric field to a mass-spectrometric device; and sensing the ions with a mass-spectrometric process of the mass-spectrometric device.

Abstract: In a method and apparatus for detecting compounds in a gas stream, the gas stream with the compounds to be detected is conducted into an ionization chamber of a mass spectrometer where the gas stream is subjected in the ion chamber in a pulsed manner alternately to UV laser pulses and to vacuum ultraviolet VUV laser pulses and the ions generated thereby are directed into the mass spectrometer for detection therein to determine the compounds in the gas stream.