Tunable laser study of the ν10 + ν11 band of cyclopropane |
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Authors: | WH Weber DH Leslie CW Peters RW Terhune |
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Institution: | 1. Research Staff, Ford Motor Co., Dearborn, Michigan 48121 USA;2. Physics Department, University of Michigan, Ann Arbor, Michigan 48109 USA |
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Abstract: | Diode laser measurements of the ν10 + ν11 (ltot = ±2) perpendicular band of cyclopropane have led to the assignments of roughly 600 lines in the 1880–1920-cm?1 region. Most of the spectra were recorded and stored in digital form using a rapid-scan mode of operating the laser. These spectra were calibrated, with the aid of a computer, by reference to the R lines of the ν1 + ν2 band of N2O. The ground state constants we obtained are (in cm?1) B = 0.670240 ± 2.4 × 10?5, DJ = (1.090 ± 0.054) × 10?6, DJK = (?1.29 ± 0.19) × 10?6, DK = (0.2 ± 1.1) × 10?6. The excited state levels are perturbed at large J values, presumably by Coriolis couplings between the active E′(ltot = ±2) and the inactive A′(ltot = 0) states. Effective values for the excited state constants were obtained by considering only the J < 15 levels. The A1-A2 splittings in the K′ = 1 excited states were observed to vary as qeffJ(J + 1), with qeff = (2.17 ± 0.17) × 10?4 cm?1. |
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