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The shape of the 00°3–00°0 CO2 band in helium has been investigated at room temperature over an extended range of perturber pressures (0–140 atm). Various and strong deviations from an additive superposition of Lorentzian lines have been observed, due to important line mixing effects enhanced by the specific structure of the R branch in this band.
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Thibault et al. (1994) studied this question.
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