Spectral emission of fractional-principal-quantum-energy-level atomic and molecular hydrogen

摘要

Extreme ultraviolet (EUV) spectroscopy was recorded on microwave discharges of helium with 2% hydrogen. Novel emission lines were observed with energies of q X 13.6 eV where q = 1,2,3,4,6,7,8,9,11 or these discrete energies less 21.2 eV corresponding to ineasltic scattering of these photons by helium atoms due to excitation of He (1s~2) to He (1s~12p~1). These lines matched H(1/p), fractional Rydberg states of atomic hydrogen, formed by a resonant nonradiative energy transfer to He~+. Corresponding emission due to the reaction 2H(1/2) -> H_2(1/2) with vibronic coupling at E_(D+Vib) = p~2E_(DH_2) +- (upsilon/3) E_((vib H_2) (upsilon = 0 -> upsilon =1)), upsilon = 1,2,3…was observed at the longer wavelengths for upsilon = 2 to upsilon = 32 and the shorter wavelengths for upsilon = 1 to upsilon = 16 where E_(DH_2) and E_((vib H_2)(upsilon=0 -> upsilon = 1)) are the experimental bond and vibrational energies of H_2, respectively. Similar emission due to Ne~+ with hydrogen was also observed,and the exothermic reaction was confirmed by the observation of 306 +- 5 W of excess power generated in 45 cm~3 by a compound-hollow-cathode-glow discharge of a neon-hydrogen (99%/1%) mixture corresponding to a power density of 6.8 MW/m~3 and an energy balance of about -5 X 10~5 kJ/(mol /H_2) compared to the enthalpy of combustion of hydrogen of -24.18 kJ/(mol H_2).