The collisional energy transfer between the D 1 Π and d 3 Π states of the NaK dimer induced by argon buffer gas

Abstract

Π→X1Σ+ transitions and the continuum spectrum of d3Π→a3Σ+ transitions of the NaK dimer in a heat pipe could be observed in the range of 500–700 nm. The collision-induced enhancement effects of the intensities Id→a and the quenching effect of the intensities ID→X by collisions with argon buffer gas at different pressures were measured experimentally. Based on the stationary collisional model and lifetime measurements, the quenching cross sections and cross sections for collision-induced energy transfer between the D1Π and d3Π states could be estimated.