THE ROTATIONALLY RESOLVED H1(U) [-A0(G)(+ -) ELECTRONIC-SPECTRUM OF HG-2/

Isotopically pure Hg-202 vapor, contained in a quartz cell, was irradi ated with the 2572.5 Angstrom output from a frequency-doubled Ar+ lase r, which produced Hg-2 A0(g)(+/-) excimer molecules by photoassociatio n followed by collisional relaxation. Simultaneously applied probe rad iation from a ring laser, scanned over the range 4150-4650 Angstrom, g ave rise to the H1(u) <-- A0(g)(+) and H1(u) <-- A0(g)(-) excitation s pectra consisting of several hundred rotational components. Two previo usly unobserved rovibronic bands (one in each spectrum) were subjected to a rotational analysis which yielded spectroscopic constants that a re compared with some previously reported values.