Radiant energy – Ionic separation or analysis – Ion beam pulsing means with detector synchronizing means
Patent
1990-02-14
1990-11-13
Berman, Jack I.
Radiant energy
Ionic separation or analysis
Ion beam pulsing means with detector synchronizing means
250282, 250281, H01V 4940
Patent
active
049703900
ABSTRACT:
An apparatus for counting individual particles in time-of-flight mass spectrometry includes a device for producing secondary particles at a high repetition rate by pulsed ion bombardment of a sample from which the secondary particles originate, an accelerator for accelerating the secondary particles, and a detector for detecting arrival of the secondary particles and producing an output signal indicating detection of a secondary particle. The output signal of the detector has a magnitude which is independent of the number of simultaneously impinging secondary particles. A fast pulse amplifier recieves the output signals and amplifies them. A fast discriminator receives the amplified signals and converts them into unit pulses, and supplies the converted signal to a shifting and attenuating device, for shifting and attenuating the unit pulses in a selected time relationship so that a noise-distorted base line of the unit pulses does not lie in a predetermined measuring range, and so that a plateau of the unit pulses lies in the predetermined measuring range. A transient recorder fed by the shifting ad attenuating device produces an output signal at a high voltage level for a short time interval in response to each of the shifted and attenuated unit pulses, representing a mass spectrum of the secondary particles.
REFERENCES:
patent: 4894536 (1990-01-01), Conzemius
Price et al., "Recent Developments in Techniques Utilizing Time-of-Flight Mass Spectrometry", Int. Journal of Mass Spect. & Ion Processes, 60 (1984), pp. 61-81.
Macfarlane et al., "Cf-Plasma Desorption Time-of-Flight Mass Spectrometry", Int. Journal of Mass Spectr. & Ion Processes, 21 (1976), pp. 81-92.
Berman Jack I.
Gesellschaft fur Strahlen- und Umweltforschung mbH (GSF)
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