POTENTIAL-ENERGY CURVE OF THE X0(-STATE OF HGAR DETERMINED FROM A0(+)((3)PI) -] XO(+) AND B1((3)SIGMA(+)) -] XO(+) FLUORESCENCE-SPECTRA()((1)SIGMA(+)) GROUND)

A0(+)((3) Pi) --> X0(+)((1) Sigma(+)) and B1((3) Sigma(+)) --> X0(+)(( 1) Sigma(+)) fluorescence spectra of HgAr van der Waals molecules were previously produced in a pulsed supersonic molecular beam crossed wit h a pulsed dye-laser beam, following excitation of single vibronic lev els. The dispersed fluorescence displayed characteristic Condon intern al diffraction (CID) patterns consisting of bound-free reflection type , continuous spectra, and also bound-bound discrete features. An analy sis of the A0(+) --> X0(+) and B1 --> X0(+) bound-bound spectra indica tes that a Morse function is an adequate representation of the X0(+) p otential energy (PE) curve below the dissociation limit. In simulation of the A0(+) --> X0(+) bound-free spectra the Morse, Lennard-Jones (n - 6) and Maitland-Smith functions were tested, and the Maitland-Smith potential was found to be a good representation of the repulsive wall of the X0(+) PE curve above the dissociation limit over the internucl ear separation range R = 2.8-3.5 Angstrom.