Analyse Rotationnelle de la Bande (0,0) du Système Orange de ScO

Abstract

The orange system of ScO has been reanalyzed as a 2Π → 2Σ transition. We have observed all the branches which are compatible with the selection rules ΔJ = 0, ± 1. We have not detected the hyperfine structure in the excited state, the coupling case being therefore aβ. The magnetic hyperfine interaction inducing the ground state doubling is the only one which appears; it has been analyzed by other authors who have shown that the coupling case for this state is of the type bβS.The use of an alloy hollow-cathode lamp, cooled with liquid nitrogen, has enabled us to improve the frequency measurements. The values of the constants have been obtained by a method by which, working directly with the Hamiltonian, the introduction of each parameter can be justified. The study of the Λ doubling in 2Π3/2 and 2Π1/2 levels leads us to values of ξ and η very close to those predicted for a pure precession case.

A study of the A2Π–X2Σ+ and B2Σ+–X2Σ+ band systems of scandium monosulfide, ScS, using Fourier transform emission spectroscopy and laser excitation spectroscopy

“…The two sets of parameters are in reasonably good agreement and the differences can be attributed to the improved wavenumber determination and the re-assignment of some of the weaker features. Also presented in Table 2 is a comparison of the ScS spectroscopic parameters with those for X 2 R + [14,19], A 2 P [14,20] and B 2 R + [21] states of ScO.…”

“…The same branch-labeling scheme was used for ScO [14]. The LIF data for the A 2 P-X 2 R + band consists of all 16 expected branches while the FT emission data for the A 2 P 3/2 -X 2 R + sub-bands consists of the P P 23 , Q P 23 + Q Q 23 , Q P 24 + Q Q 24 , R Q 23 + R R 23 , R Q 24 + R R 24 , and S R 24 branches.…”

The Sc+NO→ScO+N reaction: Rotational state distribution in ScOX 2Σ+(v″=0)

“…It led also to intense signals but, unfortunately, the spectroscopy of the ͑0-0͒ absorption band is by far less accurate and extends over a more limited range of rotational quantum numbers. 18 Strictly speaking these conditions correspond to a beam-gas arrangement. However according to the angular spreads of the two beams ͑Ϯ2°for the beam of Sc, Ϯ17°for the beam of NO͒ ScO molecules are produced in a 4 mmdiam, 8 mm-length cylinder; according to the 2 mm-diam of the laser beam, these molecules are probed in the central part of the cylinder only, reducing the cross volume seen by the PMT to a 2 mm-diam, 4 mm-length ellipsoid ͑shaded area of the insert, Fig.…”

High-Resolution Laser Spectroscopy of ZrN: The (0,0) Band of the A2Π–X2Σ+ Transition

“…This expectation is derived from a comparison of the electronic states of YO, TiN, and ScO (7)(8)(9)(10)(11)(12)(13). Figure 6 shows the molecular orbitals (MO) formed from the Zr metal 5s and 4d atomic orbitals (AO) and nitrogen 2 p AOs.…”

“…Using laser-induced fluorescence (LIF) spectroscopy, Cheung and co-workers (4-6) studied the (1,1) and (2,2) bands of the A 2 -X 2 + transition for the various isotopomers of ZrN, and elucidated the magnetic hyperfine structure of the X 2 + state of 91 ZrN. ZrN is isoelectronic with YO (7) and has a valence electronic configuration similar to that in TiN (8,9) and ScO (10)(11)(12)(13). In view of the perturbations observed in the spectra of these isovalent molecules, it is not surprising that the spectrum of ZrN is also heavily perturbed.…”