@article {822, title = {Internuclear distance and effects of Born-Oppenheimer breakdown for PtS, determined from its pure rotational spectrum}, journal = {Journal of Chemical Physics}, volume = {121}, number = {8}, year = {2004}, note = {ISI Document Delivery No.: 845HYTimes Cited: 13Cited Reference Count: 55}, month = {Aug}, pages = {3486-3494}, type = {Article}, abstract = {Platinum monosulfide PtS has been prepared in its X0(+) ground electronic state by laser ablation of Pt in the presence of H2S. The rotational spectra of eight isotopic species have been measured with a cavity pulsed jet Fourier-transform microwave spectrometer. Spectral analysis using a multi-isotopomer Dunham-type expression produced values for Y-01, Y-02, Y-11, and Y-21, along with large values for Born-Oppenheimer breakdown (BOB) parameters for both atoms of the molecule. The BOB parameters are rationalized in terms of the molecular electronic structure and nuclear field shift effects. A large negative Pt-195 nuclear spin-rotation constant has been rationalized in terms of the electron-nucleus dipole-dipole hyperfine constant. The equilibrium bond length in the Born-Oppenheimer approximation has been evaluated. (C) 2004 American Institute of Physics.}, keywords = {BISMUTH IODIDE BII, COUPLING CASE C, DIATOMIC-MOLECULES, DUNHAM COEFFICIENTS, ELECTRIC-DIPOLE MOMENT, EMISSION-SPECTROSCOPY, FIELD SHIFT, FOURIER-TRANSFORM SPECTROSCOPY, HYPERFINE CONSTANTS, NUCLEAR-CHARGE, RADII}, isbn = {0021-9606}, url = {://000223234200017}, author = {Cooke, S. A. and Gerry, M. C. L.} }