Abstract
A previous study on the absorption spectrum of C3F7I indicated the presence of a transition of the collisionless absorption spectrum in the presence of collisions.1 We report a systematic study of the pressure dependence of this spectrum to investigate the characteristics of this transition. C3F7I, with 27 vibrational degrees of freedom, has a room-temperature spectrum that is congested with multitudes of hot bands owing to low-frequency modes. The molecule is, therefore, in its quasicontinuum (QC) of vibrational states at room temperature. The consequent IR spectrum is smooth and featureless. Tire C-F stretch absorption spectrum, spanning 1020-1060 cm−1, is used in this experiment because it overlaps the 9-μm CO2 laser transitions.
© 1991 Optical Society of America
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