Chopping the radiation field in the cavity of a helium-cadmium laser operating at 4416 AA induces perturbations in the populations of the 5s 2 2D3/2,5/2 and 5p 2P3/2 levels of Cd II. Analysis of the perturbations of the 5p 2P 3/2 and 5s2 2D5/2 populations shows that the ratio of non-radiative to radiative de-excitation rates for the upper laser level is 0.9+or-0.2, approximately independent of discharge conditions. From the population changes of the 5s2 2D3/2 level the cross section for excitation from the 5s2 2D5/2 level by electron collisions is found be be approximately 7*10-16 cm2 and the ratio of this cross section to that for excitation from the 5p 2P3/2 level is 10-3.
|Number of pages||9|
|Journal||Journal of Physics B: Atomic and Molecular Physics|
|Publication status||Published - 1974|