Linear prediction ion cyclotron resonance spectrometry apparatus

Details Linear prediction ion cyclotron resonance spectrometry apparatus Linear prediction ion cyclotron resonance spectrometry apparatus

1990-01-08

1991-09-10

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

250292, B01D 5944, H01J 4900

Patent

active

050476360

ABSTRACT:
A gaseous sample for mass spectroscopy analysis is introduced into an ion resonance cell within an evacuated chamber. An electron beam is passed through the cell to ionize the gas. A magnetic field is applied along a first direction within the cell and a static electric field is applied along a second direction orthogonal to the first direction. The combined action of the magnetic and static electric fields confine the ions and cause them to orbit. An alternating electric field is created within the cell to excite ions having mass-to-charge ratios within a predetermined range. A time domain signal produced by the excited ions is detected and digitized. The digital samples of the time domain electical signal are transformed into frequency domain data by linear prediction using a linear lest-squares procedure. The resultant frequency domain data contains information about the mass of the different types of ions present in the cell and the relative number of each type.

REFERENCES:
patent: 4065714 (1977-12-01), Hill
patent: 4397955 (1976-02-01), Comisarow et al.
patent: 4855593 (1989-08-01), Bodenhausen et al.
"Estimating the Parameters of Exponentially Damped Sinusoids and Pole-Zero Modeling in Noise", IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-30, No. 6. 12/82.
"Retrieval of Frequencies, Amplitudes, Damping Factors and Phases from Time-Domain Signals Using a Linear Least-Squares Procedure", Journal of Magnetic Resonance, 61, 465, (1985) Barkhuijsen et al.

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