Processes of the formation of HgBr and HgCl excimer molecules in gas-discharge radiation sources

摘要

The additional processes of excitation of B ~2 Σ _(12) - state of HgBr and HgCl excimer molecules in gas-discharge plasma on HgBr_2/HgCl_2/He and HgBr_2/HgCl_2/N_2/He mixtures have been investigated (together with dissociation of mercury dihalides by electronic shock, which is the basic process). The pumping of working mixtures was implemented by high-frequency (f= 1000 Hz) barrier and surface discharges of nanosecond duration (～100 ns), taking place simultaneously. The essential increase in the amplitude (up to 3 times), radiation pulse duration (up to 2 times) and their back edge (up to 15 times) has been revealed with the addition of molecular nitrogen in the HgBr_2/HgCl_2/He working mixture, and also the difference in value of amplitudes of the first, second and third pulses have been revealed. It has been established, that the change in temporary radiation parameters is caused by the transfer of energy from molecular nitrogen in metastable state A~3Σ~+_u, at collisions with molecules of mercury dihalides. One more additional process, increasing the amplitude of the second and third radiation pulses both in the HgBr_2/HgCl_2/He mixtures, and in the HgBr_2/HgCl_2/N_2/He mixtures is the excitation of the HgBr(X~2Σ~+_(1/2)) and HgCl(X~2Σ~`+_(1/2)) radicals in the B~2Σ~+_(1/2) - state by the electrons.