LOW LYING ELECTRONIC STATES OF SnS AND PbS
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Date
1980
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Ohio State University
Abstract
Emission from chemiluminescent SnS and PbS flames has extended spectroscopic observations of these molecules to 790 nm (SnS) and 900 nm (PbS). Analysis of the low resolution spectra of the flame has led to the observation of a new band system, a1-X$0^{+}$, in which the upper state is the Hund’s case (c) analogue of the $a^{3}\Sigma^{+}$ state in isovalent molecules (SiO, SiS etc.). A new progression of bands in the flame spectrum has been combined with high resolution absorption measurements of two other progressions and assigned to the $A0^{+}-X0^{+}$ system. The two lowest excited states, al and $A0^{+}$, have thus been established and details of their positions and vibrational frequencies will be presented. The $A1-X0^{+}$ system of PbS, which was observed as an extensive band system in the flame spectra, has been extended beyond previous observations. Analysis of the bands has led to revisions of the vibrational numbering in the al state. This work completes a series of experiments on the lying states of group IV oxides and sulphides. A summary will be presented correlating the results for this group of molecules.
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