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Novel methods for diagnostics of molecular hydrogen plasma processes, such asionization, production of high vibrational levels, dissociation of moleculesvia excitation to singlet and triplet states and production of metastablestates, are presented for molecular hydrogen plasmas in corona equilibrium. Themethods are based on comparison of rate coefficients of plasma processes andoptical emission spectroscopy of lowest singlet and triplet transitions, i.e.Lyman-band ($B^1\Sigma^+_u \rightarrow X^1\Sigma^+_g$) and molecular continuum($a^3\Sigma^+_g \rightarrow b^3\Sigma^+_u$), of the hydrogen molecule in VUVwavelength range. Comparison of rate coefficients of spin-allowed and/orspin-forbidden excitations reduces the uncertainty caused by thenon-equilibrium distributions of electron energy and molecular vibrationallevel, which are typically known poorly in plasma sources. The describedmethods are applied to estimate the rates of various plasma processes in afilament arc discharge.

VUV diagnostic of electron impact processes in low temperature molecular hydrogen plasma