Radiant energy – Ionic separation or analysis – With sample supply means
Patent
1995-11-22
1997-05-13
Berman, Jack I.
Radiant energy
Ionic separation or analysis
With sample supply means
250287, H01J 4910, H01J 4940
Patent
active
056295189
ABSTRACT:
In order to improve a process for detecting sample molecules in a carrier gas, wherein a divergent stream of carrier gas is generated by means of expansion of the carrier gas through a nozzle into a vacuum, the sample molecules are ionized selectively to form sample molecule ions in an ionization zone of the stream of carrier gas by absorption of photons and the sample molecule ions are drawn by an electrical pulling field into a mass spectrometer, such that the sensitivity of the process is distinctly increased without forfeiting selectivity, it is suggested that a continuum zone of the stream of carrier gas, in which the temperature of the carrier gas decreases with increasing distance from an exit aperture of the nozzle, a molecular beam zone of the stream of carrier gas, in which the temperature of the carrier gas does not essentially decrease any further with increasing distance from the exit aperture of the nozzle, and a boundary between the continuum zone and the molecular beam zone be determined and that the sample molecules be ionized in an ionization zone near to the boundary between the continuum zone and the molecular beam zone.
REFERENCES:
patent: 4365157 (1982-12-01), Unsold et al.
patent: 5496998 (1996-03-01), Bergmann
Lubman et al, Review of Scientific Instruments 56 (3), Mar. 1985, pp. 373-376.
Grotheer Horst-Henning
Oser Harald
Thanner Reinhold
Berman Jack I.
Deutsche Forschungsanstalt fuer Luft-und Raumfahrt e.V.
Lipsitz Barry R.
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