- Laser-rf double resonance spectroscopy of174YbF in the X2∑+ state: Spin-rotation, hyperfine interactions, and the electric dipole moment
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We report the first laser-radio-frequency double resonance spectrum of a simple lanthanide compound, the paramagnetic radical 174YbF. Measurements of the rf intervals as a function of the rotational quantum number N allow us to determine precise spin-rotation and fluorine hyperfine interaction coupling constants for the X2∑+(v =0 and v = 1) ground states of 174YbF. The results for v=0 are γ0=-13.424 00(16) MHz, γ1=3.9823(11) kHz, γ2=-25(1) mHz, b0= 141.795 6(5) MHz, b1, = -0.510(11) kHz, c = 85.4026(14) MHz, C=20.38(13) kHz. For v = 1 they are γ0=-33.811 8(7) MHz, γ1=4.323(6) kHz, γ2=-28(9) mHz, b0= 139.89(4) MHz, b1=-0.7(4) kHz, c=86.75(5) MHz, C=18.3(1) kHz. A direct microwave measurement of the first rotational interval in X2∑+(v=0) gives the rotational constant B0=0.241 292 7(7) cm-1. Finally, the Stark shift of hyperfine transitions in the first two rotational states of X2∑+(v=0) are analyzed to determine the electric dipole moment μe=3.91(4) D. We find that although the gross structure of YbF in its ground state resembles that of an alkaline earth monofiuoride, the 4f shell is evidently important even in the low-lying excited states and leads to unusual behavior in the ground-state magnetic structure.
- Sauer,Wang, Jun,Hinds
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- Laser fluorescence study of ytterbium plus halomethane reactions
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The reactions of ytterbium (Yb) with a series of halomethanes (RX) have been studied in a beam plus gas arrangement.The unrelated YbX products are detected by cw tunable dye laser excitation.Prominent sequences belonging to the YbX (A 2Π1/2-X 2Σ+) band systems are readily identified in the region 5350-6450 Angstroem.The vibrational state distributions exhibited by the YbX products are characteristically bell-shaped, suggesting a direct reaction mechanism.Moreover, the fraction of energy released into YbX product vibration is found to increase with the reaction exoergicity and with the degree of halogenation in RX.These systematic trends in the energy partitioning are correlated with recent results from the well-studied alkali and alkaline-earth analogs.
- Dirscherl, R.,Lee, Henry U.
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