Physics
Scientific paper
Feb 1968
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968zphy..212...32b&link_type=abstract
Zeitschrift für Physik, Volume 212, Issue 1, pp.32-47
Physics
5
Scientific paper
The decay of rf signals δm=±1 between the Zeeman sublevels of mercury atoms in the metastable 63 P 2 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 section σ 0=(1,80±0,11) · 10-14 cm2 for depolarizing collisions between metastable mercury atoms (even isotopes) and ground state atoms was derived. A comparison of σ 0 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.
Baumann Marlyse
Jacobson E.
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