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

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

“…Also, because the angular momentum is greater (l(l ϩ 1) ϭ 12 compared to 2 for the p electron), it would require only a very small amount of 4f character in the X state to cancel the positive contribution to ␥ of the 6p electron. Dunfield et al (3) Cl. Over 1300 lines have been measured, assigned, and fitted in a nonlinear least-squares global fit of molecular parameters for each isotopomer.…”

High-Resolution Laser Spectroscopy of YbCl: The B2Σ+–X2Σ+ Transition

“…Gas-phase YbCl was produced in a Broida oven as previously described (1) by entraining the vapor from a heated mixture of YbCl 3 and Al in argon at a pressure of ∼0.2 Torr. The molecules were excited using a Coherent 699-29 ring laser operating in single-frequency mode with Coumarin 480 dye and the resulting fluorescence was detected by a Jarrell Ash 0.5-m monochromator.…”

“…This followed previous studies of the equivalent transition in YbF (2)(3)(4)(5). These experiments are all part of a study of the ytterbium halides with the aim of understanding in greater detail the electronic structure and bonding properties of molecules with both open and closed f shells.…”

Radiative branching ratios for excited states of 174YbF: Application to laser cooling

“…Molecules that fall into v ′′ = 2 are now repumped through the first vibrationally excited A-state and relax incoherently back into the cooling cycle. However, this vibrationally excited state in YbF is strongly mixed with a perturbing state, sometimes called [18.6]0.5 [11,12], resulting in two states, which we label by their energy in THz relative to X(v ′′ = 0) as [557] and [561]. While the X and A states of YbF come from the Yb + 4f 14 6s and 4f 14 6p configurations respectively, the perturber is thought to come from the Yb + 4f 13 6s 2 configuration [12].…”