Measurement and Analysis of the ν4 Band of Fluoroform and Its Molecular Constants

The ν4 fundamental of fluoroform has been measured with a tunable diode-laser source spectrometer. The following molecular constants were determined: ν0=1377.8458 cm−1, B4=0.344788 cm−1, C4=0.189134 cm−1 (Cζ)4=0.18619 cm−1, D4J=3.78×10−7 cm−1, D4JK=−5.73×10−7 cm−1, D4K=2.94×10−7 cm−1, η4J=1.44×10−6 cm−1, and η4K=−8.2×10−7 cm−1. Using the molecular constants of the 2ν3, the Coriolis x-y interaction constant between the ν4 fundamental and 2ν3, |ζ334|, was estimated to be 0.065.