THE VISIBLE SPECTRUM OF PLATINUM MONOSULFIDE; PtS,

Abstract

The broad banded survey laser induced fluorescent (LIF) spectrum of a molecular beam formed by skimming the products of a Pt ablation/$(H_{2}S+A_{r})$ supersonic expansion source has been recorded in the 530nm to 720nm spectral region. Strong bands at 540 nm, 555 nm, 611 nm and 628 nm, are attributed to Pts. The band systems at 540 nm, 555 nm and 628 nm have been recorded at high resolution. There was no observed hyperfine splitting in the high resolution LIF spectrum of ${^{195}pt}(I=1/2)S$ isotopic form, suggesting that both the ground and excited state have $\Omega=0$. The band system at 628 nm was fit to a simple ${^{1}\Sigma}-{^{1}\Sigma}$ model with the determined parameters being ($in cm^{-1}$ for ${^{196}}PtS): T_{00}=15924.2912(2), B^{\prime}=-0.13798(3), D^{\prime}=-1.9(8)\times 10^{-7}, B^{\prime\prime}=0.14710, D^{\prime\prime}=-2.6(9) \times 10^{-7}$ The isotopic shifts of this band system suggest that $v^{\prime}=v^{\prime}=0$. A comparison with the spectral properties of PtO will be given.