Laser induced fluorescence spectroscopy of 142NdO

Spectroscopy of 142NdO: New results

“…No X doubling is apparent in the rotational levels up to J = 44, but perturbed rotational structures extend to higher J. Combination differences indicate clearly that (2)5 m = 0 is the lower level of the transition, a level observed by Linton et al [6] in fluorescence transitions from [15.6] m = 0 J = 6, 8, 40, and 42, the direct fluorescence lines being accompanied by some relaxation lines. The upper level of the transition is most probably the lowest vibrational level of an X = 6 state, and it is also the upper level of the 0-0 transition of system VIII described below.…”

“…No new observations involving the (2)2 state have been obtained in the present work. We have found 28 lines of the [16.7] À (2)2 0-0 fluorescence in the range of Js 3-6, 12-14, 18-20 on the spectra recorded by Linton et al [6]; wavenumbers have been fitted (r.m.s. deviation = 0.021 cm À1 ) to obtain improved spectroscopic constants for (2)2 m = 0.…”

“…During the course of the preceding laser experiments on NdO fluorescence at the LASIM [6], contributions from thermal emission appeared in the region corresponding to the systems already described by Kaledin et al [2], but these bands were not analysed. We have now analysed these spectra and also the thermal emission spectra between 14 000 and 14 300 cm À1 .…”

“…The (1)2 m = 0 level. By ring laser excitation of several lines in the 0-0 band of system X, Linton et al [6] observed fluorescence transitions in the 15 380 cm À1 region starting from the [16.7]3 m = 0 J = 4, 6, 13, 19, and 43 levels and corresponding to a new transition. As the first line was clearly R (2), the lower level of the transition was assigned as m = 0 of an X = 2 state, more precisely the (1)2 state, since its energy of about 1350 cm À1 was in very good agreement with KulikovÕs prediction [4] J = 2 up to J = 44 in both sublevels of (1)2 m = 0.…”

“…Vibrational spacings were obtained for X4 and (1)3. These results were then complemented by the study of Linton et al [6] from laser-induced fluorescence spectra recorded at high resolution by Fourier transform spectroscopy; both fixed frequency Ar + laser and a tunable ring dye laser operating in the regions of the 0-0 bands of the systems VIII and X (as cited in [2]) were used. Rather complex spectra were observed, but a number of classical fluorescence patterns with two or three main lines could be distinguished, sometimes associated with some relaxation lines.…”