High-resolution infrared spectrum of the ν4 band of POF3 by laser Stark spectroscopy

Transitions in the ν4 band of POF3 have been observed by means of an infrared laser Stark spectrometer resonating on the CO2 R (38) to R (54) laser lines near 10.1 μm. Many POF3 transitions were observed for this perpendicular band with both ΔM=0 and ΔM=±1 selection rules. Many of the lines were observed as Lamb dips. The spectral assignment was confirmed by the observation of a number of infrared-microwave double resonances. Molecular constants obtained from analysis of the laser Stark spectra are ν4=29768578.6±1.0 MHz, A4=4803.06±0.16 MHz, B4 =4584.67±0.03 MHz, (Aζ)4=2429.0±0.2 MHz, μ4 =1.8394±0.0004 D, and μ0=1.8696±0.0004 D.