Abstract
The concentration N H − of negative hydrogen ions in a low-voltage cesium-hydrogen discharge plasma N H − is determined from experiments with laser radiation absorption caused by the photodetachment of electrons from the H− ions. The resolution of a setup measuring the relative absorption is ≥10−5 for a signal-to-noise ratio of ∼10−2 or less. A heated-cathode diode is used to initiate the discharge at a voltage of U≤10 V and a current density of j≤5 A/cm2 (hydrogen pressure p H 2 is equal to several torr, and the cesium concentration in the plasma N (0)Cs ∼1014 cm−3). The absorption due to the photoionization of excited Cs atoms is shown to be negligible. The measured concentration N H − of the H− ions is 1012–1013 cm−3. Experimental results are consistent with the theory.
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Translated from Zhurnal Tekhnichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 71, No. 8, 2001, pp. 17–22.
Original Russian Text Copyright © 2001 by Baksht, Ivanov, Kon’kov, Shkol’nik.
An erratum to this article is available at http://dx.doi.org/10.1134/1.1448978.
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Baksht, F.G., Ivanov, V.G., Kon’kov, S.I. et al. Determination of the negative hydrogen ion concentration in a cesium-hydrogen discharge. Tech. Phys. 46, 946–951 (2001). https://doi.org/10.1134/1.1395113
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DOI: https://doi.org/10.1134/1.1395113