Total ion number determination in an ion cyclotron resonance mas

Details Total ion number determination in an ion cyclotron resonance mas Total ion number determination in an ion cyclotron resonance mas

1998-05-28

2000-09-05

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

Methods

250286, H01J 4900, B01D 5944

Patent

active

061146927

ABSTRACT:
The total number of ions created br obtained during an ionization or ion introduction event in a Fourier transform ion cyclotron resonance mass spectrometer are determined either by using an on-resonance experimental technique or an off-resonance experimental technique. Both techniques exploit ion magnetron motion. In the on-resonance technique the spectrometer is excited in the magnetron mode and the single resonance signal resulting from this excitation is detected to determine the total number of ions. In the off-resonance technique the magnetron mode is excited at a frequency that is near the magnetron frequency while simultaneously detecting the resulting ion motion. The off-resonance technique leaves the ion population in a state that is amenable to subsequent analysis.

REFERENCES:
patent: 3937955 (1976-02-01), Comisarow et al.
patent: 4933547 (1990-06-01), Cody
patent: 4959543 (1990-09-01), McIver et al.

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