Mass spectrometer ion excitation system

Details Mass spectrometer ion excitation system Mass spectrometer ion excitation system

1985-01-28

1989-10-17

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

250282, 250291, H01J 4936

Patent

active

048749435

ABSTRACT:
Gaseous ions trapped within an analyzer cell of an ion cyclotron resonance mass spectrometer are excited into resonance by a swept radio-frequency electric field having an envelope of trapezoidal shape. The envelope includes an onset region which ramps linearly from a zero level to a non-zero constant-amplitude level, a constant-amplitude region having the non-zero constant-amplitude level, and a termination region which ramps linearly from the constant-amplitude level to the zero level. The field has a generally constant-amplitude power spectrum and imparts relatively uniform energy to ions having natural cyclotron frequencies of interest.

REFERENCES:
patent: 3461381 (1969-08-01), Nelson et al.
patent: 3511986 (1970-05-01), Llewellyn
patent: 3742212 (1973-06-01), McIver
patent: 3937955 (1976-02-01), Comisarow et al.
patent: 3984681 (1976-10-01), Huntress

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