Radiant energy – Ionic separation or analysis – Cyclically varying ion selecting field means
Reexamination Certificate
2005-05-31
2005-05-31
Berman, Jack I. (Department: 2881)
Radiant energy
Ionic separation or analysis
Cyclically varying ion selecting field means
C250S282000
Reexamination Certificate
active
06900433
ABSTRACT:
A method for ejecting ions from a quadrupole ion trap includes creating a digital control signal, using the digital control signal to control the timing of a switch unit to generate a time-varying rectangular wave voltage, supplying the rectangular wave voltage to the ion trap to trap ions in a predetermined range of mass-to-charge ratio, and varying the duty cycle of every nth wave of the rectangular wave voltage (where n is an integer greater than 1) to cause ejection of ions having a predetermined mass-to-charge ratio. The method can be used for analysis of mass-to-charge ratio by adjusting the frequency of the rectangular wave voltage to select a starting point for scanning mass-to-charge ratio, and then varying the frequency while the duty cycle is being varied to cause ejection of trapped ions, in sequence, according to mass-to-charge ratio.
REFERENCES:
patent: 3920985 (1975-11-01), Hiller et al.
patent: 5248882 (1993-09-01), Liang
patent: 1088090 (1984-04-01), None
patent: 1660075 (1991-06-01), None
patent: WO 01/29875 (2001-04-01), None
Waldren, et al., The Quadrupole Ion Store (Quistor). Part III Studies on Phase-Synchronised Ion Ejection: The Effection of Ejection Pulse Width And Detection Pulse Delay, International Journal of Mass Spectrometry and Ion Physics, 1979, pp. 315-335, vol. 29, Elsevier Scientific Publishing Company, Amsterdam.
Sheretov et al., Modulation Parametric Resonances and Their Influence on Stability Diagram Structure, International Journal of Mass Spectrometry, Apr. 1998, pp. 207-216, vol. 184, Elsevier Scientific Publishing Company, Amsterdam.
Bonner et al., Ion-Molecule Reaction Studies With A Quadrupole Ion Storage Trap, International Journal of Mass Spectrometry and Ion Physics, Dec. 1972, pp. 197-203, vol. 10, No. 2, Elsevier Scientific Publishing Company, Amsterdam.
March et al., Practical Aspects of Ion Trap Mass Spectrometry vol. 1, Fundamentals of Ion Trap Mass Spectrometry, 1995, pp. 4-48, CRC Press, Inc.
Sheretov et al., Theory of the Pulsed Quadrupole Mass Spectrometer, May 1972, pp. 953-962, vol. 42, No. 5, Ryazan Radio Engineering Institute.
Ding et al., Ion Motion in the Rectangular Wave Quadrupole Field and Digital Operation Mode of a Quadrupole Ion Trap Mass Spectrometer, Vacuum Science and Technology, 2001, pp. 176-181.
Berman Jack I.
Leydig , Voit & Mayer, Ltd.
Shimadzu Research Laboratory (Europe) Ltd.
LandOfFree
Method and apparatus for ejecting ions from a quadrupole ion... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for ejecting ions from a quadrupole ion..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for ejecting ions from a quadrupole ion... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3410133