Extended Analysis of the Spectrum of Triply-ionized Ytterbium (Yb IV) and Transition Probabilities (original) (raw)
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Inner shell and double excitation spectrum of ytterbium involving the 4f and 6s subshells
Journal of Physics B-atomic Molecular and Optical Physics, 1992
The absorption spectrum of ytterbium in the wavelength range 1200-2000 A has been recorded in the first order of a 3 m spectrograph equipped wilh a 6000 line mm-' holographic grating, using synchrotron radiation as the background source of continuum. More than 200 new levels of Yb I are reponed which are interpreted as the inner shell transitions, 4P46s2 + 4f13(2F,/,,,/,)nd, ng and the doubly excited transitions, 4f"6s2 -4f145d(2D,/,,,/2)np, nf and 4f"6s2 -4f'46p(zP,/2,3/2)ns, nd All the observed levels lie above the first ionization threshold and can be ordered into Rydberg Series converging onlo six limits. The interchannel interactions between the overlapped series have been parametrized using multichannel quantum defect theoty. PI n! 1985, Kaenders e! a! 1990). The. annearanre. rr ifite.gx~mbin~tiofi !ices C i n n D I r -'6''"'Y the breakdown of the L S coupling selection rules. From the observed long Rydberg series, which are amenable to an MQDT analysis, an accurate first ionization limit of ytterbium is derived as 50 443.08 + 0.05 cm-' .
Journal of Physics B: Atomic, Molecular and Optical Physics, 2001
The analysis of the spectrum of Yb III has been extended allowing us to establish 11 new energy level values. In addition, radiative lifetimes of two excited states of Yb III have been measured for the first time using time-resolved laserinduced fluorescence following two-photon excitation. The good agreement between experimental results and semi-empirical calculations performed with the relativistic Hartree-Fock method including core-polarization effects allows the determination of transition probabilities for 15 lines.
Improved Wavelength Measurement of 2S1/2→2P1/2 and 2D3/2→3[3/2]1/2 Transitions in Yb+
Journal of Russian Laser Research, 2019
Trapped ions nowadays play an important role in both fundamental science and technical applications. Due to its convenient energy structure, singly charged ytterbium ion is widely used in microwave and optical frequency standards, tests of fundamental theories, and quantum information science. In this paper, we present the results of wavelengths measurements in the 2 S 1/
International Journal of Quantum Chemistry
We present a comprehensive theoretical study of the electronic structures of the Yb atom and the Yb 2 molecule, respectively, focusing on their ground and lowestlying electronically excited states. Our study includes various state-of-the-art quantum chemistry methods such as CCSD, CCSD(T), CASPT2 (including spin-orbit coupling), and EOM-CCSD as well as some recently developed pCCD-based approaches and their extensions to target excited states. Specifically, we scan the lowest-lying potential energy surfaces of the Yb 2 dimer and provide a reliable benchmark set of spectroscopic parameters including optimal bond lengths, vibrational frequencies, potential energy depths, and adiabatic excitation energies. Our in-depth analysis unravels the complex nature of the electronic spectrum of Yb 2 , which is difficult to model accurately by any conventional quantum chemistry method. Finally, we scrutinize the bi-excited character of the first 1 Σ + g excited state and its evolution along the potential energy surface.
Physical Review A, 2008
By performing high-resolution two-color photoassociation spectroscopy, we have successfully determined the binding energies of several of the last bound states of the homonuclear dimers of six different isotopes of ytterbium. These spectroscopic data are in excellent agreement with theoretical calculations based on a simple model potential, which very precisely predicts the s-wave scattering lengths of all 28 pairs of the seven stable isotopes. The s-wave scattering lengths for collision of two atoms of the same isotopic species are 13.33͑18͒ nm for 168 Yb, 3.38͑11͒ nm for 170 Yb, −0.15͑19͒ nm for 171 Yb, −31.7͑3.4͒ nm for 172 Yb, 10.55͑11͒ nm for 173 Yb, 5.55͑8͒ nm for 174 Yb, and −1.28͑23͒ nm for 176 Yb. The coefficient of the lead term of the long-range van der Waals potential of the Yb 2 molecule is C 6 = 1932͑30͒ atomic units ͑E h a 0 6 Ϸ 9.573ϫ 10 −26 J nm 6 ͒.
Lifetime measurements and calculations in singly ionized ytterbium
Journal of Physics B: Atomic, Molecular and Optical Physics, 2002
New radiative lifetimes, measured by time-resolved laser-induced fluorescence spectroscopy, are reported for five Rydberg states of singly ionized ytterbium. Free Yb + ions were produced in a laser-induced plasma. The experimental results have been compared with HFR calculations, taking core-polarization effects into account, and a good agreement (within 25%) between theory and experiment is observed for four levels. HFR results are also proposed for np (n 7) and nf(n 8) Rydberg states and compared with available data.
Physical Review A, 1999
We h a ve observed the Stark-induced 6s 2 1 S0 ! 5d6s 3 D1 transition in Yb and measured properties relevant to the study of atomic parity nonconservation in this transition. An atomic beam of Yb is excited by 408 nm light in the presence of an external DC electric eld, resulting in cascade uorescence at 556 nm as the excitation decays through the 6s6p 3 P1 state. The density of the atomic beam and the uorescence detection e ciency are calibrated by directly exciting the 6s6p 3 P1 state with 556 nm light. Using an estimate of the 3 D1 , 3 P1 branching fraction, we obtain a measurement of the vector transition polarizability, j j = 2 :1833 10 ,8 ea0=V=cm: In addition, we h a ve observed the 6s 2 1 S0 ! 5d6s 3 D2 transition at 404 nm. The electric quadrupole transition amplitude and tensor transition polarizability have been measured. We h a ve also measured the DC Stark shifts, hyper ne structure, and isotope shifts for both transitions.