15min:
THE OPTICAL STARK SPECTRUM OF the [17.8]0+-X1 Sigma+ BAND OF GOLD MONOFLUORIDE,AuF.

RUOHAN ZHANG, CHENGBING QIN AND TIMOTHY C. STEIMLE, Department of Chemistry and Biochemistry, Arizona State University, Tempe,AZ 85287; THOMAS VARBERG, Department of Chemistry,Macalaster College,1600 Grand Avenue, St. Paul,MN 55105.

The bonding and electrostatic prperties of gold containig molecules are highly influenced by realtivistic effects. Recently Varberg's group reported on the field-free detection and analysis of the [17.8]0+-X1 Sigma+ band system of AuF at Doppler limited resolution. Here we report on the analysis of the same band recorded field free and in the presence of a static electric field for a cold molecular beam sample. The Stark induced shifts of the R(0)(17756.156 cm-1), R(1)(17756.640 cm-1) and P(1)(17755.123 cm-1)branch features were analyzed to determine the permanent electric dipole moment, µel, of 2.025 D and 4.218 D for the [17.8]0+ and X1 Sigma+ states, respectively. The agreement with the various DFT and wave-function based predictions will be discussed.