Sub-Doppler spectroscopy of the (A)over-tilde(2)Sigma(+)-(X)over-tilde(2)Pi and (B)over-tilde(2)Pi-(X)over-tilde(2)Pi transitions of NCO

摘要

Sub-Doppler laser induced florescence spectra were recorded of a selection of bands within the (A) over tilde (2)Sigma(+)-(X) over tilde (2)Pi and (B) over tilde (2)Pi-(X) over tilde (2)Pi transitions of NCO in a supersonic molecular beam. The light source was a diode seeded optical parametric oscillator, which gave an effective resolution of 0.01 cm(-1) in the ultraviolet. Analysis of the (A) over tilde (2)Sigma(+)-(X) over tilde (2)Pi transition at high resolution allowed fitting of both the fine and hyperfine structures, and a set of rotational and hyperfine constants were obtained for 13 vibronic levels within the (A) over tilde (2)Sigma(+) state including levels of both (2)Sigma(+) and (2)Pi vibronic characters. Analysis of the 0(0)(0) and 1(0)(1) bands of the (B) over tilde (2)Pi- (X) over tilde (2)Pi transition, together with a band from the (A) over tilde (2)Sigma(+) state at the same energy, was also performed. These did not reveal any hyperfine structure although the resolution was the same as the work at lower total energy, and this observation is discussed. Refined rotational constants and perturbation parameters for the interaction between the (A) over tilde and (B) over tilde states were also obtained. (C) 2008 American Institute of Physics. [DOI: 10.1063/1.2987305]