Abstract
Infrared intensities have been measured for ν 2 of CS 2 in the gas and liquid phases. The values (500 darks in the gas phase and 800 darks in the liquid) are approximately as expected from the Polo—Wilson equation, but both are somewhat lower than previous estimates had suggested. The bond moments are ε (= dμ/ dr) = 5·6 D/A and μ = 0·60 D, or roughly comparable to the values for other linear triatomic molecules. The explanation for the anomalously high value of ε seems almost certainly to be the large contribution from the “delocalization moment” as a result of a change in the electronic wave function during the vibration. An attempt to estimate the magnitude of the “delocalization moment” is presented; the results confirm the interpretation, although the quantitative agreement could be better.
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