Cross sections and thermal rate coefficients are computed for electron-impact dissociative recombination vibrational excitation/de-excitation of the N$^+_2$ molecular ion in its lowest six levels, collision energies/temperatures up to 2.3 eV/5000 K.

Ž . The quenching of highly vibrationally excited O in collision with O Õs0 is investigated using a semiclassical wave 2 2 Ž . packet method. We find that nonreactive collisions dominate the relaxation of O Õ and for Õ in the range 25 to 30 the 2 reactive channel makes little contribution to the quenching process, in agreement with our earlier investigation. We report Ž . vibrational transition...

Relative vibrational populations of triplet B5g , W 1u, B ′36− u states of N2 and the b 16+ g state of O2 are calculated for different altitudes of the high-latitude upper atmosphere during auroral electron precipitation. It is shown that collisional processes cause a wavelength shift in the distribution of relative intensities for 1PG 1v=3 sequence of N2. The calculation of relative population...

We investigate the OH stretch vibrational frequency shifts of a prototype photoacid, 2-naphthol (2N), when dissolved in solvents of low polarity. We combine femtosecond mid-infrared spectroscopy and a theoretical model based on the Pullin-van der Zwan-Hynes perturbative approach to explore vibrational solvatochromic effects in the ground S(0) and the first electronically excited (1)L(b) states....

Ro-vibrational energy levels of acetylene are reported using variational nuclear motion calculations from new ab initio and empirically optimized full six-dimensional potential surfaces in the ground electronic state molecule. The account for triple, quadruple quintuple excitations as well relativistic diagonal Born-Oppenheimer corrections. Variational were performed exact kinetic operator orth...

We show that the collective vibrational model of atomic nuclei displays quantum chaos. To avoid the problems related to the tunneling effects, a Green function deterministic numerical method has been used to evaluate the energy levels.

An empirical potential energy surface has been developed for the Ne·OH/D complexes from the experimentally observed vibrational and rotational energy levels with ab initio calculations being used for initial esti-