OPTO-GALVANIC SPECTROSCOPY OF SOME MOLECULES IN DISCHARGES - NH2, NO2, H-2 AND N2

The change of the discharge voltage when laser light crossing the discharge is tuned to a molecular transition has been measured. Experiments have been performed in the wavelength region between 570 nm and 620 nm with discharges in NH3, NO2, H2, N2, O2 and argon. Transitions from the ground states of NH2 and NO2 and transitions from metastable states of N2 and H2 have been detected. The spacial dependence of the opto galvanic in a low pressure dc-discharge of H2 and N2 has been studied. © 1979.