Abstract

Two photon excitation spectra of nitric oxide molecule from X^{II_1/2, X2II_3/2 to 4d Rydberg state O′2II– (v = O, 1) have been observed by using a frequency-doubled dye laser (283.4-293.5 nm). Ten rotational branches O₂₁ + P₁₁, P₂₁ + Q₁₁, Q₂₁ + R₁₁, R₂₁ + S₁₁, S₂₁; O₂₂ + P₁₂, P₂₂ + Q₁₂, Q₂₂ + R₁₂, R₂₂ + S₁₂ and S₂₂ are assigned for O′2II– – X2II– (0,0) band and (1,0) band. Rotational lines of P₂₁ + Q₁₁ and Q₂₁ + R₁₁ branches are easily observed to J = 24 and J = 16, respectively. Rotational analyses of these branches allow calculation of accurate values of O′2II– state rotational constants and vibronic level energy. For v = 0, Bv = 1.997 ± 0.002 cm–1, To = T_e + G(v) = 68944.0 ± 0.8 cm–1 and for v = 1, Bv = 1.985 ± 0.002 cm–1, T_o = 71283.6 ± 0.8 cm–1. Fifteen branches of the excitation spectra from X2II– to 3d Rydberg states H′2II– (v = 1, 2, 3) in the 287.8–308.4 nm region are studied. Molecular constants of H′2II– state are obtained: for v = 1, T_o = 66010.1 ± 0.8 cm–1, Bv = 1.968 ± 0.002 cm–1; v = 2, T_o = 68316.9 ± 0.8 cm–1, Bv = 1.942 ± 0.002 cm–1, and v = 3, T_o = 70587.1 ± 0.8 cm–1, Bv = 1.941 ±v 0.002 cm–1. Laser-induced spectra of NO from various vibronic levels of H′2II–, O′2II– states are also observed. Emission spectra H′ 2II––D 2Σ+, C 2II, C 2II-A 2Σ+ are in the IR region (800–1150 nm); O′ 2II–-C 2II, D 2Σ+ in the visible region (630–690 nm); and the fluorescence progressions D 2Σ+, C 2II, A 2Σ+–X 2II to v" = 11 in the UV region (170–340 nm).}

© 1990 Optical Society of America