15min:

CHENGBING QIN AND TIMOTHY C. STEIMLE, Department of Chemistry and Biochemistry, Arizona State University, Tempe,AZ 85287.

Recently the O'Brien group reported on the field-free detection and analysis of the [11.9]Ømeiga=3/2-X² _3/2 band system of PtF using intracavity laser absorption. The hollow cathode condition limited the spectral resolution, which was insufficient to fully resolved the hyperfine splitting of ¹^9⁵Pt (I=1/2) and ¹^9F (I=1/2). Here we report laser-induced fluorescence spectra of the 1-0 and 0-0 bands of the [11.9]Ømeiga=3/2-X² _3/2 transition of PtF, obtained at near natural linewidth resolution (FWHM ~40MHz) using supersonic molecular beam techniques. The spectra show a complex, cleraly resolved hyperfine structure which has siginificant contributions from magnetic term in ¹^9⁵Pt and ¹^9F. The spectra of ¹^9⁴PtF, ¹^9⁵PtF, ¹^9⁶PtF, ¹^9⁸PtF isotopogues have been assigned and analyzed. The electric field induced dependence of the R(1.5) branch of the ¹^9⁵PtF isotopogue was analyzed to produce permanent electric dipole moment, µ, of 3.45 D and 2.32 D for the X² _3/2 and [11.9] =3/2 states, respectively. A comparision with Ab Initio prediction^, will be given.