Abstract
The diode laser absorption spectrum of the v19a band of fluorobenzene molecule near 1500 cm−1 has been measured in a pulsed supersonic jet and transitions from low J, Ka, and Kc. values (2–24) are reported. The band centre has been found at and rotational constants for the upper state as determined from a least-squares fitting to experimental data have been found to be A19a, = 0.188 77(5), B19a = 0.08569(5) and C19a = 0.058 94(1) cm−1. In addition, a number of weak transitions assigned to δKa = ±2, δKc = ±1. ±3 have been observed, with higher intensities than those expected in the rigid rotor model. A discussion of their origin is presented.
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