Pressure Induced Shifts of HCl Absorption Lines in the Infrared

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Abstract
The shift of infrared absorption lines due to pressure changes are small and they are difficult to measure. However it has been found possible to study this effect with the large spectrometer in Rehovoth which is particularly suited for the determination of small wavelength differences. Pressure induced shifts of the individual lines of the HCl 2–0 band at 1.76 μ have been measured over a range of pressures below atmospheric. A strong dependence of the shift on the rotational quantum numbers was found. For self-shifts the lines near the band center were shifted toward the blue and others toward the red. The results are discussed qualitatively. Measurements on shifts due to the addition of a foreign gas are also reported.

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