5 research outputs found
Parity Nonconservation in Odd-isotopes of Single Trapped Atomic Ions
We have estimated the size of the light-shifts due to parity nonconservation
(PNC) interactions in different isotopes of Ba+ and Ra+ ions based on the work
of Fortson [Phys. Rev. Lett. 70, 2383 (1993)]. We have used the nuclear spin
independent (NSI) amplitudes calculated earlier by us [Phys. Rev. Lett. 96,
163003 (2006); Phys. Rev. A 78, 050501(R) (2008)] and we have employed the
third order many-body perturbation theory (MBPT(3)) in this work to estimate
the nuclear spin dependent (NSD) amplitudes in these ions. Ra+ is found to be
more favourable than Ba+ for measuring both the NSI and NSD PNC observables.Comment: 5 pages, 1 tabl
Ab initio determination of polarizabilities and van der Waals coefficients of Li atoms using the relativistic CCSD(T) method
We report a new technique to determine the van der Waals coeffcients of
lithium (Li) atoms based on the relativistic coupled-cluster theory. These
quantities are determined using the imaginary parts of the scalar dipole and
quadrupole polarizabilities, which are evaluated using the approach that we
have proposed in [1]. Our procedure is fully ab initio, and avoids the
sum-over-the-states method. We present the dipole and quadrupole
polarizabilities of many of the low-lying excited states of Li. Also, the
off-diagonal dipole and quadrupole polarizabilites between some of the
low-lying states of Li are calculated.Comment: 8 pages, 4 figure
Ab initio determination of the lifetime of the state f or by relativistic many-body theory
Relativistic coupled-cluster(RCC) theory has been employed to calculate the
life time of the state of single ionized lead() to an
accurac y of 3% and compared with the corresponding value obtained using second
order r elativistic many-body perturbation theory(RMBPT). This is one of the
very few ap plications of this theory to excited state properties of heavy
atomic systems. C ontributions from the different electron correlation effects
are given explicitl y