Cold jet infrared absorption spectroscopy: The ν3 band of PF5

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Abstract
The ν3 band of PF5 is studied at a low rotational and vibrational temperature using a tunable diode laser. Infrared absorption in a pulsed supersonic free jet of PF5, pure or seeded in Ar, is observed by phase‐sensitive detection synchronized with the pulse frequency. Well resolved K structure is observed for the ν3 fundamental and the ν3+ν7←ν7 hot band. Seven molecular constants are determined for the ν3 fundamental and five constants for the hot band. The splitting due to Berry pseudorotation is not found in these two bands under the present resolution of 10 MHz.

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