High-resolution infrared spectrum and analysis of the 2v3 band of CF3Cl

The 2~ band of CFrCl and several hot bands of the most abundant isotope, CF335CI, have been investigated using a tunable diode laser spectrometer. The K fine structure of the 2v, fundamental of the CF335CI isotopic species has been measured for about 50 multiplets from P(70) up to R( 101). Accurate molecular constants for the 2v, band were obtained from a least-squares fit of more than 1000 P(J, K) and R(J, K) transitions (K Q 48). Assuming additivity for aA and (1' constants, values of (Y: = 28.6(3) X 1O-6 cm-' and (I? = 70.34(4) X 10e6 cm-' were calculated. Many unresolved P(J) and R(J) multiplets were observed and assigned to the 2~3 fundamental of the CFa3'CI isotopic variety and to the hot bands 2vj + vg - +,, 2v, + V~ - y5, and 3~ - v, of the most abundant CF3"CI.