Radiant energy – Ionic separation or analysis – Methods
Patent
1988-04-08
1989-11-28
Fields, Carolyn E.
Radiant energy
Ionic separation or analysis
Methods
250281, 250282, 250288, 250289, H01J 4900
Patent
active
048839574
ABSTRACT:
The invention comprises a mass spectrometer adapted for the determination of isotopic ratios which has several ion-collecting means disposed along its mass focal plane. Separate current amplifier means are provided for each ion collecting means and comprise an electrometer amplifying element, and an input resistor disposed in an inner box, itself disposed within a sealed evacuated housing. Means are provided for cooling the amplifier element to a temperature substantially below 20.degree. C. Means are provided for maintaining the temperature of at least the input resistor substantially constant. Cooling the amplifier element, typically to between 0.degree. and 5.degree. C., results in an unexpected reduction in low frequency noise which allows the time required to determine an isotope ratio to be reduced, thereby substantially increasing sample throughout.
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Kinge Nigel
Mills David J.
Sanderson Neil E.
Fields Carolyn E.
Miller John A.
VG Instruments Group Limited
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