Direct observation of nonadiabatic transitions in Na+rare-gas differential optical collisions

Abstract

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Nonadiabatic transitions in the exit channel of atom-molecule collisions: Fine-structure branching in Na+N2

“…Considering the excitation of the repulsive B 2 ⌺ state of the collision complex a characteristic dependence of p 1/2 on the collision energy is observed differing substantially for the lighter and heavier rare gases. [3][4][5] For He and Ne, the B 2 ⌺ state is well above the A 2 ⌸ state for all distances before approaching the same asymptote. In consequence, p 1/2 remains small due to preferentially adiabatic behavior on the upper adiabatic state correlating with the jϭ3/2 level of Na(3p).…”

“…3,4 In combination with beam techniques, experiments with well-defined kinematic and energetic conditions have become possible. 5 We report here a differential scattering study of the process…”

Short-Range Characterization of the MeAr (Me=Zn, Cd) Ground-State Potentials from Fluorescence Spectra

“…The simulation procedure has been described elsewhere (5)(6)(7)(8)25) and here we emphasize only its important aspects. The Morse [1] and Lennard-Jones L-J(n − 6), U L -J (R), 2 functions as representations of the ZnAr and CdAr ground-state repulsive walls were assumed initially. The computer-simulation program used the analytical form of the ground state potential to generate wave functions associated with its energy continuum (25).…”

“…The computer simulation of the bound-bound part of the D1 v =10 → X 0 + spectrum was performed assuming the Morse potential [1] for the D1 and X 0 + states in ZnAr, where D e is a well depth, β = (8π 2 cµω e x e / h) 1/2 , c is a speed of light, µ is the reduced mass of the ZnAr, and h is the Planck constant. This assumption was justified by the analysis of the D1 ← X 0 + v =0 spectrum in Ref.…”

“…In the rapidly evolving field of matter-wave interferometry, in order to determine an index of refraction of a rare-gas medium for atomic waves, it is necessary to know the interatomic potential of metal (Me)-rare gas (RG) systems not only in the long-range limit, which is important in laser cooling and optical trapping techniques, but also at short range as well as in the bound well region (1). The repulsive parts of interatomic potentials are important in Me and RG crossedbeams experiments involving processes of optical collisions (2). In these studies, the short-range parts of the potential energy (PE) curves are probed and, therefore, analytically represented for the X 2 and B 2 repulsive parts of the NaNe, NaAr, NaKr, and NaXe molecules.…”