15min:

BLAKE A. MCELMURRY, ZHONGCHENG WANG, ROBERT R. LUCCHESE AND JOHN W. BEVAN, Chemistry Department, Texas A&M University, College Station, TX 77843-3255; SERGEY P. BELOV, Institute of Applied Physics of Russia Academy of Sciences, Uljanova Str. 46, Nizhny Novgorod 603950, Russia.

The assigned rotational-tunneling transitions including quadrupole substructure of H⁷⁹Br-H⁸¹Br are combined with previously recorded rovibrational infrared and microwave data, to provide a basis for optimizing a ground state four-dimensional morphed potential with quantifiable uncertainties. The determined potential minimum has a value V = -644.0 cm^-1 at the geometry R = 4.04 Å, ₁ = 16.9^\circ, ₂ = 108.3^\circ, and = 180.0^\circ. The peak of the minimum energy path between the two equivalent minima occurs at V = -571.2 cm^-1, leading to a barrier height of 72.8 cm^-1. A corresponding investigation for the HI dimer will also be presented.