Radiant energy – Ionic separation or analysis – Ion beam pulsing means with detector synchronizing means
Reexamination Certificate
2006-08-15
2006-08-15
Wells, Nikita (Department: 2881)
Radiant energy
Ionic separation or analysis
Ion beam pulsing means with detector synchronizing means
C250S282000, C250S288000
Reexamination Certificate
active
07091480
ABSTRACT:
In an analysis using a mass spectrometer having a loop orbit along which ions are made to fly a plurality of times, the present invention provides a method of determining the mass-to-charge ratio of an ion without limiting the range of the mass-to-charge ratio of the ions to be brought into the loop orbit while allowing the lapping of the orbiting ions. The measurement is carried out two or more times under different conditions (Tg=500[μs], 400[μs]) under which the number of turns of the ion concerned is different. Flight times are determined from the flight time spectrums obtained by at least two measurements. Though the numbers of turns themselves are unknown, it is possible to calculate possible mass-to-charge ratios for each flight time by incrementally setting the number of turns at plural values. The two sets of possible mass-to-charge ratios derived from the two flight time values (525[μs], 441[μs]) determined by the two measurements are compared with each other, and a value that is found in both measurement results is selected as the mass-to-charge ratio of the ion concerned. Thus, it is possible to determine the mass-to-charge ratio without limiting the range of the mass-to-charge ratio before the ions are brought into the loop orbit.
REFERENCES:
patent: 6037586 (2000-03-01), Baril
patent: 6576895 (2003-06-01), Park
patent: 11-135061 (1999-05-01), None
patent: 11-297267 (1999-10-01), None
Ishihara Morio
Toyoda Michisato
Yamaguchi Shin-ichi
Leybourne James J.
Osaka University
Shimadzu Corporation
Wells Nikita
Westerman, Hattori, Daniels & Adrian , LLP.
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