Radiant energy – Ionic separation or analysis – Cyclically varying ion selecting field means
Patent
1994-11-10
1995-10-17
Berman, Jack I.
Radiant energy
Ionic separation or analysis
Cyclically varying ion selecting field means
250290, H01J 4942
Patent
active
054593158
ABSTRACT:
A quadrupole mass analyzer in which a pair of heat sink plates 16, 17 and springs 18 clamp ceramic holders 13, 14 that hold the four rod electrodes 12 of the quadrupole unit. The dielectric heat generated in the ceramic holders 13, 14 by the high frequency alternating electromagnetic field due to the AC voltage applied on the four rod electrodes 12 is promptly transferred to the heat sink plates 16, 17. Thus displacement of the four rod electrodes 12 or loss of symmetry is prevented when mass of ions is analyzed.
REFERENCES:
patent: 3371205 (1968-02-01), Berry
patent: 4032782 (1977-06-01), Smith et al.
patent: 4731533 (1988-03-01), Vestal
patent: 4885470 (1989-12-01), Abbott
Patent Abstracts of Japan, vol. 8, No. 213 (E-269), Sep. 28, 1984, Yasutaka Masatoshi, "Quadrupole Mass Spectrometer" (JP-A-59-098-448).
Patent Abstracts of Japan, vol. 16, No. 112, (E-1180), Mar. 19, 1992, Norio Kameshima, "Quadruople Mass Spectrometric Device" (JP-A-03-285-246).
Patent Abstracts of Japan, vol. 15, No. 3 (E-1019), Jan. 7, 1991, Hiroto Itoi, "Multipolar Electrode" (JP-A-02-257-558).
Berman Jack I.
Beyer James
Shimadzu Corporation
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