The system of a magnetized sheet plasma crossed with a vertical gas flow has been proposed to produce a high H À density. Under a secondary hydrogen gas supply entering into the plasma, the peak position of the H À ion density n H À is localized in the periphery of the sheet plasma. The value of n H À increases with increasing the discharge current I d . The variation of the hydrogen negative ion density is proportional to the vacuum ultraviolet (VUV) emission intensities of the Lyman band and the Werner band in hydrogen molecular bands. The measured H À density was compared with the theoretical calculation based on the rate equation of the transport of vibrationally excited hydrogen molecules H 2 Ã ðX 1 AE g þ ; v 00 > 5Þ.
Finite-element integration of the Schrodinger equation for the time evolution of a wavepacket is used to solve the two-dimensional model of electron impact ionisation proposed by Temkin and Hahn, and Peterkop and Rabik, as a test bench for mathematical and numerical techniques. The quantitative features of Wannier's transition state theory are reproduced, not only at threshold, but at much higher energies. Ionisation probabilities and ejected electron spectra are presented from threshold up to initial energies nine times the threshold energy.
Normal-incidence vacuum ultraviolet reflectivity spectra in the range 4 to 14 eV have been measured from the basal faces of single crystals of the dichalcogenides of W and MO (with the exception of WTe,). Correlations between the spectra are interpreted in terms of chemical effects in the band structures and models for the conduction bands of the MO and W compounds are proposed, which account for the absence of strong plasma effects in the W compounds.
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