Radiant energy – Ionic separation or analysis – Cyclically varying ion selecting field means
Patent
1976-06-04
1977-06-28
Church, Craig E.
Radiant energy
Ionic separation or analysis
Cyclically varying ion selecting field means
250290, H01J 3934
Patent
active
040327825
ABSTRACT:
A method of selecting a material for the construction of a multipole mass filter that is temperature stable or in other words, the R.sub.o parameter remains invariant with change in temperature. The coefficients of thermal expansion of the quadrupole rods and mounting structure are chosen so that a constant ratio of the two is provided which in turn is determined by the geometrical construction of the filter.
REFERENCES:
patent: 3553451 (1971-01-01), Uthe
Fies William J.
Reeher John R.
Smith Ronald D.
Story Michael S.
Church Craig E.
Finnigan Corporation
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