Electron impact excitation
of the D states of Mg,
Ca and Sr atoms: Complete
experiment results
SACHIN SAXENA, KSHAMATA MUKTAVAT* and
RAJESH SRIVASTAVA
Department of Physics, Indian Institute of
Technology, Roorkee 247 667, India
*Present address: Physics Department,
Government PG College, Rampur 244 901, India
E-mail: rajsrfph@iitr.ernet.in
Abstract.
We have used non-relativistic and relativistic
distorted
wave approximation methods to study the
excitation
of the $n$\,$^1D$ states of magnesium ($n=3$),
calcium
($n=4$) and strontium ($n=5$) from the ground
$n$\,$^1S$
state. Calculations have been performed for the
complete
set of parameters ($\sigma, \tilde{L}_\perp^+,
\tilde{L}_\perp^-,
\tilde{\ga}^+, \tilde{\ga}^-$). The
results
are presented for electron impact energies of 20
and
40 eV. We compare our results obtained from both the
non-relativistic
and relativistic methods with each other.
Good
agreement is found on comparison and the importance of
relativistic
effects is also explored.
Keywords. Electron; excitation; atoms; complete experiment.