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

✍ Scribed by Todd C. Melville; John A. Coxon; Colan Linton

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
104 KB
Volume
200
Category
Article
ISSN
0022-2852

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✦ Synopsis

The A 2 ⌸-X 2 ⌺ ϩ transition of 174 Yb 35 Cl and 172 Yb 35 Cl 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 Ϫ1 . 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 A 2 ⌸ state are A e ϭ 1491.494(2) cm Ϫ1 and R e ϭ 2.4433(1) Å, and for the X 2 ⌺ ϩ state, R e ϭ 2.4883(2) Å and ␥ e ϭ 4.59(2) ϫ 10 Ϫ3 cm Ϫ1 . The interaction between the X 2 ⌺ ϩ and A 2 ⌸ states has been investigated and is shown to be the main contributor to the spin-rotation splitting in the ground state.

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