SPECTROSCOPY OF THE A0+ AND B1 STATES IN HGAR AND HGNE

Excitation spectra of HgNe and HgAr van der Waals molecules were produced in a pulsed supersonic molecular beam crossed with a pulsed dye-laser beam. -Bands arising from A0+ <-- X0+ and B1 <-- X0+ vibronic transitions were analyzed, yielding spectroscopic constants for HgNe and HgAr. A0+ --> X0+ and B1 --> X0+ fluorescence spectra of HgAr were also recorded, consisting of Condon internal diffraction patterns arising from bound-free decays of various vibronic states, together with vibrational components produced by bound-bound transitions. Term analyses of the spectra combined with computer-modeling calculations produced improved values of spectroscopic constants.