Method and apparatus for generating ions from thermally unstable

Details Method and apparatus for generating ions from thermally unstable Method and apparatus for generating ions from thermally unstable

1992-03-12

1994-03-15

Berman, Jack I.

Radiant energy

Ion generation

Electron bombardment type

250288, 250286, 250287, H01J 4914

Patent

active

052947971

ABSTRACT:
Method for generating ions from thermally unstable, non-volatile, large molecules, particularly for a mass spectrometer such as a time-of-flight mass spectrometer. A specimen substance comprising the molecule is exposed to energy pulses with which molecules are released from the specimen substance, and the released molecules are entrained by a jet of a carrier gas and are cooled upon expansion thereof and are subsequently ionized in an ionization chamber. The molecules are ionized by electron impact, the power per unit area of the electrons employed for the ionization is selected such that a potential trough is generated in the focus of the electron beam, the depth thereof being greater than the translational energy of the molecule ions in the carrier gas stream. The molecule ions generated by the electron impact ionization are respectively collected in the potential trough for a defined time span. The molecule ions respectively collected in the potential trough are accelerated out of the ionization chamber in pulsed fashion. The invention is also directed to an apparatus particularly for the implementation of this method.

REFERENCES:
patent: 3182190 (1965-05-01), Lilly, Jr. et al.
patent: 3296434 (1967-01-01), Studier
patent: 4570066 (1986-02-01), Schlag et al.
patent: 5032722 (1991-07-01), Boesl et al.
patent: 5146088 (1992-09-01), Kingham et al.
"Die Multiphotonen-Ionisations (MUPI)-Massenspektrometrie" Angewandte Chemie, 100. Jahrgang 1988, Heft 4, Seite 461-610 (pp. 461-474).

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