Excitation spectra of the D1(51P1) <--- X0+(51s0) transition of CdNe and CdAr molecules in a jet-expansion beam

摘要

Excitation spectra of CdNe and CdAr van der Waals molecules were studied in free-jet expansion molecular beams crossed with a beam of exciting radiation from a pulsed dye laser. The molecules were produced as Cd atoms seeded in Ne or Ar were expanded through a nozzle and the excitation spectra were recorded by scanning the second-harmonic output of the dye laser in the immediate vicinity of the Cd(5$+1$/P$-1$/ < - 5$+1$/S$-0$/) atomic transition, in the range 2288 - 2290.5 angstroms for CdNe and 2288 - 2305.5 angstroms for CdAr. Analyses of the vibrational structures of the spectra yielded the molecular constants approximately ega$-e$/, approximately ega$-e$/$chi$-3$/, and D$-e$ for the D1 states of CdNe and CdAr. Computer-modelling of the spectra based on calculations of Franck-Condon factors utilizing the Morse potential produced the equilibrium internuclear separations.