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VUV ABSORPTION SPECTROSCOPY OF A PENNING SURFACE-PLASMA NEGATIVE HYDROGEN ION SOURCE (NEGATIVE HYDROGEN ION, PENNING SPS, SURFACE PLASMA SOURCE).
註釋Measurements of ground-state atomic hydrogen density and temperature in a Penning SPS are presented. These measurements are the first of this kind for this type of discharge. An upper limit on the H$\sp-$ density in the extraction region of the source is measured by the application of a novel diagnostic technique: the hydrogen atom density following H$\sp-$ photodetachment by a Nd:YAG beam is measured and compared to the equilibrium atomic density. A simple model is derived that describes the dependence