Radiant energy – Ionic separation or analysis – Cyclically varying ion selecting field means
Patent
1986-05-23
1988-08-02
Anderson, Bruce C.
Radiant energy
Ionic separation or analysis
Cyclically varying ion selecting field means
250290, 250282, B01D 5944
Patent
active
047615451
ABSTRACT:
An ion cyclotron resonance cell has applied thereto an excitation which has a time domain waveform which is the inverse Fourier transform of a frequency domain excitation spectrum which has been chosen by the user to yield selective excitation and/or suppression of ranges of ion mass-to-charge ratios. To minimize the dynamic range of the time domain signal resulting from the inverse Fourier transform, the phases of the various discrete frequency components in the frequency domain spectrum which are used in calculating the inverse Fourier transform are not constant but rather are varied as a function of the frequency of the components. The phase of each component is assigned such that the frequency components in the time domain signal are not all in phase at any point in time, thereby avoiding large magnitude spikes in the time domain waveform. The phases of the various frequency components may follow a non-linear function of the frequencies of the components, such as a quadratic function. By varying phase in this manner, the time domain signal which is applied to the excitation plates of the ion cyclotron resonance cell has a frequency domain power spectrum which is substantially flat over the specified band or bands of frequencies of interest. The time domain waveform may be shifted and/or weighted before being applied to the excitation plates. Tailored excitation may also be applied in this manner to the end plates of an ion trap cell to cause tailored ejection of specific bands or ranges of ions with retention of remaining ions within the cell.
REFERENCES:
patent: 2939952 (1960-06-01), Paul et al.
patent: 3461381 (1969-08-01), Nelson et al.
patent: 3475605 (1969-10-01), Llewellyn
patent: 3511986 (1970-05-01), Llewellyn
patent: 3527939 (1970-09-01), Dawson et al.
patent: 3742212 (1973-06-01), McIver, Jr.
patent: 3937955 (1976-02-01), Comisarow et al.
patent: 3984681 (1976-10-01), Fletcher et al.
patent: 4034191 (1977-07-01), Tomlinson et al.
patent: 4535235 (1985-08-01), McIver, Jr.
patent: 4540884 (1985-09-01), Stafford et al.
U.K. Patent Application GB No. 2,106,311, published Apr. 7, 1983, title: "Method for Ion Cyclotron Resonance Spectroscopy".
Barrett L. Tomlinson and H. D. W. Hill, "Fourier Synthesized Excitation of Nuclear Magnetic Resonance with Application to Homonuclear Decoupling and Solvent Line Suppression," Journal of Chemical Physics, vol. 59, No. 4, Aug. 15, 1973.
Alan G. Marshall and D. Christopher Roe, "Theory of Fourier Transform Ion Cyclotron Resonance Mass Spectroscopy: Response to Frequency-Sweep Excitation," Journal of Chemical Physics, vol. 73, No. 4, Aug. 15, 1980, pp. 1581-1590.
Alan G. Marshall, Tao-Chin Lin Wang, and Tom Labatuan Ricca, "Ion Cyclotron Resonance Excitation/De-Excitation: A Basis for Stochastic Fourier Transform Ion Cyclotron Mass Spectrometry," Chemical Physics Letters, vol. 105, No. 2, Mar. 9, 1984, pp. 233-235.
Alan G. Marshall, Tao-Chin L. Wang and Tom L. Ricca, "Fourier Transform Ion Cyclotron Resonance Mass Spectrometry: New Theoretical and Instrumental Developments," ASMS Meeting, San Antonio, Texas, May 27-Jun. 1, 1984, pp. 600-601.
Paper published by Finnigan Mat, entitled "New Advances in the Operation of the Ion Trap Mass Spectrometer," presented at the 33rd Annual Conference on Mass Spectrometry and Allied Topics, San Diego, Calif., May 1985.
U.S. Patent Application Ser. No. 695,847 for "Mass Spectrometer Ion Excitation System", filed Jan. 28, 1985.
Marshall Alan G.
Ricca Tom L.
Wang Tao-Chin L.
Anderson Bruce C.
Guss Paul A.
The Ohio State University Research Foundation
LandOfFree
Tailored excitation for trapped ion mass spectrometry does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Tailored excitation for trapped ion mass spectrometry, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tailored excitation for trapped ion mass spectrometry will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-712927