M. Baumann

Determination of theg j -factor in the72 P 3/2-state of133Cs by optical double resonance in a strong magnetic field

The hfs in the 72P3/2-state of133Cs has been investigated by optical double resonance in a strong magnetic field. From the positions of the magnetic dipole transitions Δmj=± 1, Δmi=0 the magnetic hfs coupling con slanta (72P3/2)=16.591(25) MHz and thegj-factorgj(72P3/2)=1.33410(15) could be derived. Contrarily to recent measurements,gj agrees well with the value calculated from the Lande formula.

Die Hyperfeinstruktur des 6s 6p3P1-Zustandes von 171Yb und 173Yb

The hyperfine structure of the 6s 6p3P1 state of171Yb and173Yb has been investigated by the level crossing technique and by optical double resonance. The following results for the magnetic hfs splitting constantA and for the electric quadrupole interaction constantB have been obtained:A(171Yb)=3959.1(14)Mc/sec;A(173Yb)=−1094.7(6) Mc/sec;B(173Yb)=−826.9(9) Mc/sec. The hyperfine structure anomaly of the isotopes171Yb and173Yb was determined to beΔ=−0.36(3)%.

Untersuchungen von Relaxationserscheinungen an Quecksilberatomen im metastabilen 63P2-Zustand mit einem Impulsverfahren

The decay of rf signalsδm=±1 between the Zeeman sublevels of mercury atoms in the metastable 63P2 state was investigated by means of a sampling method. The density matrix of the state was expanded in terms of irreducible tensor operators. By solving the appropriate differential equations, we were able to show that the time constant of the decay obtained from the measurements is the relaxation time for the longitudinal component of the mean electric quadrupole moment (alignment) of the metastable atoms. The linewidths of the rf resonances reflect the relaxation rates of the transverse components however. From the decay time, the cross sectionσ0=(1,80±0,11) · 10−14 cm2 for depolarizing collisions between metastable mercury atoms (even isotopes) and ground state atoms was derived. A comparison ofσ0 with the value which was previously determined from the linewidths of rf resonances, indicates that the relaxation process in a weak magnetic field is essentially isotropic.

Die Hyperfeinstruktur des angeregten 32P3/2-Zustandes von Natrium

The hyperfine structure of the 32P3/2-state in the Na(I)-spektrum was investigated by optical double resonance. Three zero fieldrf-transitions (ΔF=±1, ΔmF=0) were detected and thus the unambiguous interpretation of therf-spectrum was made possible. From an analysis of therf-spectrum one obtains the magnetic hyperfine structure splitting constant a=(18.5−0.2+0.6) Mc/sec the electric quadrupole interaction constantb=(3.2±0.5) Mc/sec which yields an electric quadrupole moment Q(Na23)=(0.138±0.025)·1024cm2.

Relaxationszeiten für die Umorientierung von Quecksilberatomen im metastabilen 63P2-Zustand durch Stöße

From the linewidth of the radiofrequency resonance between the Zeeman levels of the 63P2 state the lifetimeTm of the metastable Hg atoms in a certain magnetic sublevel was derived as a function of the Hg vapour pressure. The lifetime of the metastable stateT(63P2) was determined under the same experimental conditions by optical absorption measurements. In the pressure range from 2·10−3 to 2.4·10−2 mm HgT(63P2) was longer thanTm by one to two orders of magnitude. This result means thatTmis only dependent on disorienting collisions and is practically not affected by the collisional destruction of the metastable state. ThusTm is the relaxation time for the disorientation of the metastable atoms by collisions. The pressure dependence of the relaxation time indicates that the disorientation is achieved by two-body collisions with ground state Hg atoms. The disorientation cross section was found to be (2.1±0.2)·10−14 cm2.

Die Hyperfeinstruktur des 6s 6p 3 P 1-Zustandes von 171Yb und 173Yb@@@Hyperfine structure of the 6s 6p 3 P 1 state of 171Yb and 173Yb

The hyperfine structure of the 6s 6p3P1 state of171Yb and173Yb has been investigated by the level crossing technique and by optical double resonance. The following results for the magnetic hfs splitting constantA and for the electric quadrupole interaction constantB have been obtained:A(171Yb)=3959.1(14)Mc/sec;A(173Yb)=−1094.7(6) Mc/sec;B(173Yb)=−826.9(9) Mc/sec. The hyperfine structure anomaly of the isotopes171Yb and173Yb was determined to beΔ=−0.36(3)%.

Die Hyperfeinstruktur des 6 s 6 p 3 P 1 -Zustandes von 171 Yb und 173 Yb

The hyperfine structure of the 6s 6p3P1 state of171Yb and173Yb has been investigated by the level crossing technique and by optical double resonance. The following results for the magnetic hfs splitting constantA and for the electric quadrupole interaction constantB have been obtained:A(171Yb)=3959.1(14)Mc/sec;A(173Yb)=−1094.7(6) Mc/sec;B(173Yb)=−826.9(9) Mc/sec. The hyperfine structure anomaly of the isotopes171Yb and173Yb was determined to beΔ=−0.36(3)%.