Lifetime measurements in Yb II with time-resolved laser spectroscopy

Abstract

Abstract. Natural radiative lifetimes of 10 levels of singly ionized ytterbium have been measured with time-resolved laser spectroscopy. Free Yb + ions were produced in a laser-induced plasma. A stimulated Brillouin scattering technique has been used to produce laser pulses as short as 1 ns for the excitation of short-lived Yb + states. Pseudo-relativistic Hartree-Fock calculations, taking into account the core-polarization effects, have also been performed. A good agreement of the measured and the calculated lifetime values has been achieved.

Experimental and theoretical energy levels, transition probabilities and radiative lifetimes in YbIII

“…In the present paper, we report lifetime measurements of two 4f 13 6p energy levels in Yb III together with a comprehensive calculation performed using the relativistic Hartree-Fock (HFR) method taking both intravalence correlation and core-polarization effects into account. This paper extends lifetime measurements and calculations in Yb ions previously reported by Biémont et al (1998), Li et al (1999) and Wyart et al (2001).…”

Lifetime measurements and calculations in singly ionized ytterbium

“…They extend the measurements reported recently by Li et al (1999a), using time-resolved laser-induced fluorescence spectroscopy. Comparisons with pseudo-relativistic Hartree-Fock (HFR) calculations, taking configuration interaction and core-polarization (CP) effects into account, are also reported in the present paper.…”

“…This can be done by considering a Pauli-type approximation to the Dirac-Hartree-Fock equations (see Cowan (1981) for more details). The theoretical approach followed here is thus similar to that adopted in our recent papers concerning the same ion , Li et al 1999a and the details will not be repeated here. In particular, CP effects, which are expected to play an important role in the singly ionized heavy element Yb + , were introduced in the calculations in the way described previously (see e.g.…”

“…Li et al 1999aLi et al , 2001). These levels are 8s 2 S 1/2 , 6d 2 D 3/2 , 6d 2 D 5/2 , 7d 2 D 3/2 and 7d 2 D 5/2 .…”

Sub-Hertz Optical Frequency Comparisons between Two TrappedYb+171Ions

“…Combining these measurements we obtain S ÿ6:91:4 10 ÿ40 Jm 2 =V 2 and T D 3=2 ÿ13:62:2 10 ÿ40 J m 2 =V 2 . The experimental result is close to values calculated from available oscillator strength data [18], S ÿ4:4 10 ÿ40 Jm 2 =V 2 and T ÿ11:5 10 ÿ40 J m 2 =V 2 [19]. Figure 4 shows measurements of the frequency difference between the ions for U dc 0 and z 0 in both traps.…”