The electric quadrupole moments of carbon dioxide and carbon disulphide have been measured through the birefringence induced in gaseous samples over a range of temperature. The value for CO2, Θ = (-14·98 ± 0·50) × 10-40 C m2, is consistent with earlier measurements, showing that the temperature-independent hyperpolarizability contribution to the birefringence is insignificant. For CS2, Θ = (+12·0 ± 0·6) × 10-40 C m2. The positive sign reflects the increased importance of the π electron contribution to Θ in CS2.
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Battaglia et al. (1981) studied this question.
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