Structured bound-free emission spectra of 64Zn2 and 114Cd2 have been observed by photoassociating pairs of ground state atoms (ns21S0, n = 4 and 5 for Zn and Cd, respectively) at several discrete wavelengths in the 222-277 nm region. The observed fluorescence is attributed to B1Σu +→X g + transitions of the molecules where the bound excited state is correlated with np 1P1 + ns21S0 in the separated atom limit. The pressure dependence of the emission intensity demonstrates that the dominant 1Σu + production mechanism is photoassociation. Numerical, quantum mechanical simulations of the experimental spectra yield 1Σu + spectroscopic constants that are generally ∼10% larger than ab initio values in the literature.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry