The variational method complemented with the use of explicitly correlated Gaussian basis
functions is one of the most powerful approaches currently used for calculating the …

Theoretical chemistry could be seen as a bridge from the real physics of the physicists to the
real chemistry of the experimental chemists. We hence expect that any measurable property …

Since the early work of Hylleraas on the helium atom, 1 it has been common knowledge that,
to accurately account for the interaction between the electrons in an atom or a molecule …

In this work we develop and implement a method for calculation of the Bethe logarithm for
many-electron atoms. This quantity is required to evaluate the leading-order quantum …

We present results of high-precision calculations for a boron atom's properties using wave
functions expanded in the explicitly correlated Gaussian basis. We demonstrate that the well …

Benchmark variational calculations of the lowest ten Rydberg S 2 states of two stable
isotopes of the boron atom (B 10 and B 11) are reported. The nonrelativistic wave functions …

We report absolute frequency measurements on the three excited-state transitions
connecting the 2 p 2 (3 P) 3 s 2 P 1/2, 3/2 and 2 p 2 (3 P) 3 p 2 D 3/2, 5/2∘ states in neutral N …

The Bethe logarithm for a large set of states of the helium atom is calculated with a precision
of 12–14 significant digits. The numerical data are obtained for the case of infinite mass of a …

Variational calculations have been carried out for the ground states of several members of
the beryllium isoelectronic series using a standard Hylleraas approach involving Slater-type …

,” Phys. Rev. A 83, 032518 (2011)] reported Hylleraas-configuration-interaction (Hy-CI)
method variational calculations for the 1 S ground state of neutral beryllium with an …