Anomalous Vibrational Dependence of the Rotational and Hyperfine Parameters in the B4Π–X4Σ− Transition of NbO

Fourier transform spectroscopy of NbS

“…A comparison of the results of the present work with previous studies on NbO [9,[13][14][15] and VO [3] shows a rather notable agreement with the overall energy level structures of these molecules. However, there are some points where NbS seems to differ from the other two.…”

“…This system does exist in VO, but it has not been observed in NbO, where the transition is expected near 10 000 cm À1 [9]. According to a more recent work by Kingston et al [15], the D 4 D state of NbO is expected to be located near 17 500 cm À1 . The energy of the corresponding state (13 231 cm À1 ) of NbS seems to be in reasonable agreement with this value.…”

Identification of new bands in the red system of CoO

“…But we are not certain about that since we have no information from hyperfine parameters. A similar case can be found in NbO [17], several doublet states appear in absorption from the 4 R state, gaining their intensity from the strong B 4 P-X 4 R transition by a DX = 0 mechanism. The spin-orbit coupling constant of cobalt is larger than that of niobium, so that the effects in CoO should be more obvious.…”