https://doi.org/10.1007/s100530170194
The beryllium atom and beryllium positive ion in strong magnetic fields
Theoretische Chemie, Physikalisch-Chemisches Institut,
Universität Heidelberg, INF 229, 69120 Heidelberg,
Germany
Corresponding authors: a MIvanov@MI1596.spb.edu - b peter@tc.pci.uni-heidelberg.de
Received:
2
October
2000
Revised:
8
January
2001
Published online: 15 June 2001
The ground and a few excited states of the beryllium atom
in external uniform magnetic fields are calculated
by means of our 2D mesh Hartree-Fock method for field strengths
ranging from zero up to 
T.
With changing field strength the ground state
of the Be atom undergoes three
transitions involving four different electronic configurations
which belong to three groups with different spin projections
. For weak fields the ground state configuration arises from the
, Sz=0 configuration.
With increasing field strength the ground state evolves into the
two Sz=-1 configurations
and
,
followed by the fully spin polarised Sz=-2 configuration
.
The latter configuration forms the ground state of the beryllium atom
in the high field regime 
.
The analogous calculations for the 
ion
provide the sequence
of the three following ground state configurations:
and
(
)
and 
(
).
PACS: 32.60.+i – Zeeman and Stark effects / 31.15.Fx – Finite-difference schemes / 31.15.Ne – Self-consistent-field methods
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001
