Knowledge Bank

The laser induced fluorescence (LIF) spectrum of a molecular beam sample formed by skimming the products of a Pt ablation/ $(NH3+Ar)$ supersonic expansion source has been recorded at moderate resolution in the 530nm to 550nm spectral range. In addition to numerous weak spectral features, the strong $\Omega \prime \prime =0.5-\Omega \prime =0.5$ transition $(T00=18587cm-1)$ band system of $PtN1$ was readily identified. This system was recorded at high resolution (FWHM Mhz) in the presence of a variable static electric field. The magnitude of the permanent electric dipole moment for the ground and excited state were determined to be 2.225(9) Debye and 0.28(3) Debye, respectively, from and analysis of the LIF/Stark spectrum. The observed hyperfine splitting in the high resolution LIF spectrum of $\mathrm{<mrow\; data-mjx-texclass="ORD">195</mrow>}pt(I=1/2)N$ isotopic form could be most effectively fit to a model that assumed that the ground and excited states are of $\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\Pi$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}\Pi$ symmetry, respectively. An interpretation of the hyperfine parameters in terms of plausible molecular orbital descriptions will be presented.