Abstract

Effects of Ar addition are studied by using a beam injection type negative ion source. With adding Ar, I H − increases at low base H 2 pressure. At high base H 2 pressure, however, I H − decreases. VUV emission intensities also decrease at high base pressure. In other words, Ar addition is adverse effect for production of H 2 (v″). Therefore, decrease in I H − is caused by decrease in H 2 ( v″). In D 2 plasmas, variation patterns of plasma parameters and VUV intensities by Ar addition are nearly the same as ones in H 2 plasmas. Even in low base pressure, however, enhancement of I D − is not observed.

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