Laser Spectroscopy of the Lanthanide Monofluorides: Analysis of theA2Π–X2Σ+Transition of Ytterbium Monofluoride

✍ Scribed by K.L. Dunfield; C. Linton; T.E. Clarke; J. McBride; A.G. Adam; J.R.D. Peers

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 202 KB
• Volume: 174
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1995.0014

✦ Synopsis

High-resolution excitation spectra have been obtained of several bands in the A 2 P-X 2 S / transition of 172 YbF, 174 YbF, and 176 YbF. Vibrational, rotational, and spin-rotation constants have been determined for the ground X 2 S / state of the three isotopomers. The vibrational frequency, v e Å 506.6681(91) cm 01 , of 174 YbF, the most abundant isotopomer, confirms the assignment of this state to the Yb / (4f 14 6s)F 0 configuration. Vibrational spacings and rotational, spin-orbit, and lambda doubling constants have been calculated for the A 2 P state, which is heavily perturbed. Two vibrational levels of a new V Å 0.5 state have been observed in the vicinity of the A 2 P 1/2 state and analysis of the rotational structure and lambda (or omega) doubling of these levels indicates that this is the perturbing state. Analysis of the isotope structure establishes the vibrational numbering of the two levels as £ Å 0 and 1. The deperturbed vibrational spacing in this state is calculated to be Ç605 cm 01 and suggests that the state originates in the Yb / (4f 13 6s 2 )F 0 configuration. The lambda doubling in the A 2 P 1/2 state, originating in the Yb / (4f 14 6p) configuration, is examined in terms of its interaction with the B 2 S / state, which comes from the same configuration. Discrepancies between observed and calculated values, especially for A 2 P 1/2 £ Å 1, provide further evidence for the perturbation.