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- W2007756071 abstract "Laser photodetachment is a widely used diagnostic technique for the detection of negative ions in low-temperature plasma sources. In one common method electrons, photodetached from the negative ions by an incident laser beam, are collected by a Langmuir probe biased above the local plasma potential. The photodetachment current signal, transmitted through the Langmuir probe feedthrough and interconnecting cables (transmission circuit), is converted into a voltage signal by a detection circuit. The negative ion density and temperature (using the two-pulse technique) are obtained from signal processing. Circuit analysis of the signal acquisition circuit, both transmission and detection parts, is used to obtain the design criteria for the undistorted transmission of the photodetachment signal. The effects of changing the circuit parameters from their optimum values are investigated experimentally in a conventional low-pressure magnetron system. The results show that an inappropriate choice of the circuit parameters can lead to significant distortion of the temporal photodetachment signal, leading to large measurement errors of the negative ion density and temperature." @default.
- W2007756071 created "2016-06-24" @default.
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- W2007756071 date "2012-12-20" @default.
- W2007756071 modified "2023-10-10" @default.
- W2007756071 title "Optimum circuit design for the detection of laser photodetachment signals" @default.
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- W2007756071 doi "https://doi.org/10.1088/0963-0252/22/1/015014" @default.
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