Tunable laser study of the [nu]10 + [nu]11 band of cyclopropane

Diode laser measurements of the [nu]10 + [nu]11 (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 [nu]1 + [nu]2 band of N2O. The ground state constants we obtained are (in cm-1) B = 0.670240 +/- 2.4 x 10-5, DJ = (1.090 +/- 0.054) x 10-6, DJK = (-1.29 +/- 0.19) x 10-6, DK = (0.2 +/- 1.1) x 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 A1-A2 splittings in the K' = 1 excited states were observed to vary as qeffJ(J + 1), with qeff = (2.17 +/- 0.17) x 10-4 cm-1.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/23404/1/0000349.pd