抄録
Fundamental plasma processes of negative ions in a low pressure region (a gas pressure Pg < 1.5 Pa) have been studied using the photodetachment technique and vacuum ultraviolet (VUV) spectroscopic measurements in the spectral range from 100 to 180 nm. Understanding the behavior of a plasma with negative ions, in particular, the correlation between H- density and vibrationally excited H2 density, is of great interest in the field of atomic-molecular physics and ion source developments. The volume and the surface effects of negative ions are discussed taking into account the e-V, the E-V, and the RD processes, and the measured VUV spectrum is compared with the synthetic one. The cascade transition to the B1Σ+u state by the electron excitation contributes to the production of the highly vibrationally excited levels of the X1Σ+g ground electronic state.
