Method of chemical ionization at reduced pressures

Details Method of chemical ionization at reduced pressures Method of chemical ionization at reduced pressures

2005-11-29

2005-11-29

Lee, John R. (Department: 2881)

Radiant energy

Ionic separation or analysis

With sample supply means

C250S42300F, C250S424000

Reexamination Certificate

active

06969848

ABSTRACT:
This invention comprises an apparatus and method for generating sample ions from sample molecules in which a mixture of a sample and a matrix are vaporized by a laser beam and Subsequently ionized by reagent corona ions. The decoupling of the vaporization and ionization steps allows each process to be separately optimized. The vaporization step can be done in a sub-atmospheric pressure region. Alternatively, the vaporization and ionization steps can be done in a higher pressure region. In addition, the reagent corona ions can be generated in a vacuum chamber or a chamber at atmospheric pressure. Alternatively, the reagent ions can be generated in a sub-atmospheric region while the laser desorption occurs in an atmospheric region.

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