Abstract
The vibration-rotation spectrum of the ν 9 band of C 2H 5Cl was recorded using a Nicolet 7199 Fourier Transform Infrared Spectrometer; the Q-branch, R(5)- R(6) multiplets, and P(21)- P(22) multiplets were investigated using a tunable semiconductor diode laser spectrometer. Constants derived from these assignments are (cm −1) ν 9 = 973.8379(2), A 9 = 1.039516(3), B 9 = 0.183081(7), C 9 = 0.164505(8). The line which coincides with the CO 2 laser 10 R(6), which has been employed in multiphoton dissociation studies, is tentatively assigned to the 20 3 18-21 3 19 transition. In addition, a very strong coincidence of transitions 19 9 11-19 9 10 and 19 9 10-19 9 11 with the CO 2 10 R(16) line is found, which can provide a good candidate for laser chemistry and infrared double resonance spectroscopy.
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