Perturbation Allowed Transitions In The Infrared Spectrum Of (Nd3)-N-14: Determination Of The K-Dependent Parameters In The Ground State

Accurate values of the K-dependent constants C-(i), D-(i)(K) and H-(i)(K) in the ground state of (ND3)-N-14, with i = s, a, have been determined for the first time thanks to the detections of ` perturbation allowed' transitions in the (nu)1, nu(2), nu(3), nu(4) and 2 nu(4) infrared bands. The rotation-inversion and inversion transitions from the literature, together with 7289 ground state combination differences from the infrared vibration-rotation-inversion transitions have been simultaneously analysed. The adopted rotationinversion Hamiltonian includes distortion constants up to the eighth power and the Delta k = +/- 3 and Delta k = +/- 6 interaction terms. Precise values of the diagonal constants and of the Delta k = +/- 3 interaction coefficients have been obtained. Accurate values of the ground state term values have been calculated for both s and a levels up to J = 21.[GRAPHICS].