Pressure-Induced Shifts of Infrared Lines due to Polar Molecules

Abstract
The pressure‐induced shifts by dimethyl ether of the infrared lines of the 2–0 band of hydrogen chloride have been measured. The shifts in the R branch are similar to those produced by the noble gases, but the shifts for all the J values in the P branch are negative. Large shifts (4×10—2 cm—1 per atm) are observed for P1 and P2 and then the shifts decrease rapidly reaching a minimum at P4. For larger J values the shifts become large again. A qualitative explanation of this type of shift is given.

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