Observation of the 43Σ+ g , 33Π g , 23Δ g , and b 3Π u states of 39K2 by perturbation facilitated optical-optical double resonance spectroscopy J. Chem. Phys. 102, 6646 (1995); 10.1063/1.469137 Laser spectroscopy of the A2Π-X2Σ+ transition of SrOH: Deperturbation analysis of Kresonance in the v 2=1 level of the A2Π state Determination of the internal state distribution of NO(X 2Π) produced in the O(3 P)+NH(X 3Σ−) reaction J. Chem. Phys. 97, 180 (1992); 10.1063/1.463606 Rotation-vibration analysis by finite difference perturbation technique. Application to 1Σ+ state of NHThe v = 1-0 vibration-rotation transitions in the X 2n and a 41; -states as well as those between the two electronic states were observed with a difference frequency laser as a radiation source. The two electronic states (X 2n and a 41; -) lie close together and interact each other strongly through the spin-orbit coupling. A merged least-squares fit was carried out with the present infrared transition wave numbers, some of the previous optical term values, and the recent far-infrared rotational transition frequencies to determine the spectroscopic parameters precisely. The equilibrium internuclear distance was obtained to be 1.0692 ± 0.0002 and 1.0924 ± 0.0001 A for the X and a states, respectively. The A-type doubling transition frequencies were calculated for several of the lowest J states with the molecular constants obtained and the hyperfine coupling constants determined from the far-infrared transitions.

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The high-resolution spectrum of the ν4 fundamental band of NH3D+ has been observed in absorption in a hollow-cathode discharge with a difference-frequency laser system. The molecular constants have been determined through a least squares fit of the observed transition wave numbers to an effective Hamiltonian. The equilibrium rotational constant is estimated to be 4.438 ± 0.027 cm−1, from which the equilibrium N—H bond length is calculated to be 1.021 ± 0.003 Å. Some low-lying rotational transition frequencies in the ground state are calculated to assist in the search for pure rotational transitions in the laboratory and in interstellar space.

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