High-Resolution Laser Spectroscopy of YbCl: The A2Π–X2Σ+ Transition

Author: Melville T.C.   Coxon J.A.   Linton C.  

Publisher: Academic Press

ISSN: 0022-2852

Source: Journal of Molecular Spectroscopy, Vol.200, Iss.2, 2000-04, pp. : 229-234

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Abstract

The A2Π–X2Σ+ transition of 174Yb35Cl and 172Yb35Cl has been rotationally analyzed for the first time. Doppler-limited laser excitation spectroscopy with selective detection of fluorescence was used to obtain spectra of the 0–0 and 1–0 bands with a measurement accuracy of approximately 0.0035 cm-1. Resolved fluorescence was used to record the 0–1, 0–2, and 0–3 bands and to unequivocally assign the rotational numbering, N, to the laser excitation spectra. In total, over 1300 line positions have been measured and assigned for each of the two isotopomers and employed in least-squares fits of molecular parameters. The principal results for the A2Π state are Ae = 1491.494(2) cm-1 and Re = 2.4433(1) Å, and for the X2Σ+ state, Re = 2.4883(2) Å and γe = 4.59(2) × 10-3 cm-1. The interaction between the X2Σ+ and A2Π states has been investigated and is shown to be the main contributor to the spin–rotation splitting in the ground state.