10min:

DOMINIQUE R. T. APPADOO, K. ANDERSON, I. GORDON, A. SHAYESTEH AND P. F. BERNATH, UNIVERSITY OF WATERLOO, 200 UNIVERSITY AVENUE, WATERLOO, ON N2L 3G1, CANADA.

The infrared and visible (A-X) emission spectra of ^107/109AgH and ^107/109AgD have been recorded with a Fourier transform spectrometer. The silver hydride molecules were generated by heating Ag metal to 1050-1325^oC in a high-tempeature furnace containing a few torr of an Ar/H mixture subjected to a 3 kV / 330 mA discharge. The observed spectra consist mainly of rovibronic transitions belonging to the v = 0, ⁺_- 1, ⁺_- 2 sequences. The higher quality measurements from this study together with previous grating data on the A-X system of AgH, and micrawave data were first treated in a combined isotopomer fit to yield improved empirical molecular parameters for both the ground and first excited electronic states of each species. The A-state potential curve of AgH has an anomalous shape resulting from avoided crossings. In an attempt to better determine the A-state potential curve and its mass-dependent Born-Oppenheimer breakdown parameters, the combined data were directly fitted to potential energy functions.