State-Selective Spectroscopy in a Molecular Nitrogen Discharge by Use of Optogalvanic Double-Resonance Spectroscopy

Transitions between excited states of molecular nitrogen, which are generated in a hollow-cathode discharge, have been studied by use of optogalvanic double-resonance spectroscopy as a state-selective method. By pumping of the known (0, 0) band of the $c_4{}_{}{}^1{}_{}{}^{}\Pi _{\mathrm{u}}^{}{}_{}{}^{}-a^{\prime \prime }{}_{}{}^1{}_{}{}^{}{\Sigma }_{\mathrm{g}}_{}^{+}{}_{}{}^{}$ system in ${\mathrm{N}}_2$ the (16, 0) and (17, 0) bands of the $b^{\prime }{{}_{}{}^1{}_{}{}^{}\Sigma _{\mathrm{u}}^{}{}_{}{}^{}}^{+}-a^{\prime \prime }{{}_{}{}^1{}_{}{}^{}\Sigma _{\mathrm{g}}^{}{}_{}{}^{}}^{+}$ system have been identified for the first time, and the recent assignment for the (0, 0) band of the ${c_5}^{\prime }{{}_{}{}^1{}_{}{}^{}\Sigma _{\mathrm{u}}^{}{}_{}{}^{}}^{+}-a^{\prime \prime }{{}_{}{}^1{}_{}{}^{}\Sigma _{\mathrm{g}}^{}{}_{}{}^{}}^{+}$ system has been verified.