Radiative lifetimes and two-body collisional deactivation rate constants in argon for Kr(4p 55p) and Kr(4p 55p′) states

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Abstract
The radiative lifetimes and collisional deactivation rate constants, in argon, of eight Kr(4p5[2P1/2]5p and [2P3/2]5p) levels have been measured by a time‐resolved laser‐induced fluorescence technique in a flowing afterglow apparatus. The measured radiative lifetimes are compared with other experimental values and with theoretical calculations. Radiative branching ratios of these excited states also were measured in order to assign the absolute transition probabilities of the Kr(5p,5p′–5s, 5s′) transition array from the radiative lifetimes. In addition to the total deactivation rate constants, product states from two‐body collisions between Kr(5p and 5p′) atoms and ground state argon atoms were identified from the laser‐induced emission spectra, and product formation rate constants were assigned. Two‐body intermultiplet transfer from Kr(4p5[2P1/2]5p) to the Kr(4p5[2P3/2]4d) levels occurs with ease. Intermultiplet transfer from the lowest level in the (4p55p) configuration to the Kr(4p55s and 5s′) manifold was fast despite the large energy defect. However, this was the only Kr(5p) level that gave appreciable transfer to the Kr(5s or 5s′) manifold. Generally the favored product states are within a few kT of the entrance channel.