THE OPTICAL STARK SPECTRUM OF the [17.8]0+[17.8]0^{+}−X1Σ+-X^{1}\Sigma^{+} BAND OF GOLD MONOFLUORIDE,AuF

Author Institution: Department of Chemistry and Biochemistry, Arizona State University, Tempe,AZ 85287; Department of Chemistry,Macalaster College,1600 Grand Avenue, St. Paul,MN 55105The bonding and electrostatic prperties of gold containig molecules are highly influenced by realtivistic effects {\textbf{43}} 4412, 2004.}. Recently Varberg's group reported {\textbf{114}} 4831, 2010.} on the field-free detection and analysis of the $[17.8]0^{+}$$-X^{1}\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, $\mu_{el}$, of 2.025 D and 4.218 D for the $[17.8]0^{+}$ and $X^{1}\Sigma^{+}$ states, respectively. The agreement with the various DFT {\textbf{76}} 032507, 2007.} and wave-function {\textbf{472}} 185, 2009.} based predictions will be discussed