Grid‐gated photomultiplier photometer with subnanosecond time response
作者:
B. George Barisas,
Michael D. Leuther,
期刊:
Review of Scientific Instruments
(AIP Available online 1980)
卷期:
Volume 51,
issue 1
页码: 74-78
ISSN:0034-6748
年代: 1980
DOI:10.1063/1.1136022
出版商: AIP
数据来源: AIP
摘要:
A grid‐gated photomultiplier has been used in the construction of a subnanosecond‐time‐resolved photometer. The photocathode is gated on during a sampling window which occupies 4 ns of an 8‐ns mode‐locked ion laser cycle. The 0.5‐ns rise‐time sampling window is derived from the mode‐locker drive signal and can be adjusted in phase relative to the incident laser light pulses. By resolving scattered light pulses from long‐lived fluorescence, the photometer affords a 20‐fold reduction in scattered light interfering with photobleaching recovery measurements of low‐level fluorescence. Moreover, it has permitted the time‐domain measurement with dc circuitry of fluorescence lifetimes as short as 0.7 ns. This time response is achieved using a photomultiplier which, in the absence of grid gating, exhibits an anode pulse rise time of 18 ns. Additional applications of this device and of a related narrow‐window sampling photometer currently under development are discussed.
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