THE COLLISIONAL ENERGY-TRANSFER BETWEEN THE D-1-PI AND D(3)PI STATES OF THE NAK DIMER INDUCED BY ARGON BUFFER GAS

By using the 514.5 nm line of a cw argon-ion laser, the discrete spect rum of D-1 Pi --> X-1 Sigma(+) transitions and the continuum spectrum of d(3) Pi --> a(3) Sigma(+) transitions of the NaK dimer in a heat pi pe could be observed in the range of 500-700 nm. The collision-induced enhancement effects of the intensities Id-->a and the quenching effec t of the intensities ID-->X by collisions with argon buffer gas at dif ferent pressures were measured experimentally. Based on the stationary collisional model and lifetime measurements, the quenching cross sect ions and cross sections for collision-induced energy transfer between the D-1 Pi and d(3) Pi states could be estimated.