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<se *<
*pl 297,18,240,4,3**pn 0,0**ld8*
*lw 150**ps 50 **ct*
DISCREPANCIES BETWEEN BEAM-FOIL LIFETIMES AND THEORETICAL
LIFETIMES IN THE Mg I SEQUENCE

A. Lindgård and E. Veje
H.C. Ørsted Institute
Universitetsparken 5
DK-2100 København Ø
Denmark
and
L. Liljeby, S. Mannervik and J. Jelenkovic
Research Institute for Physics
Roslagsvagen 100
S-10405 Stockholm
Sweden
*rj*
*nl1*
Lifetime measurements using the beam-foil technique have been made
for 10 levels in Mg I. Lifetimes have been calculated for the same
levels using the numerical coulomb approximation method
(Lindgård and Nielsen 1977), and the
results are compared with experimental data. Whereas good agreement
exists for some of the low lying levels, there are large and
unexpected disagreements for some of the higher lying levels.
*nl*
There is good agreement between Hartree-Fock lifetimes
(Weiss 1967, Froese Fischer 1975a, 1975b) and numerical
coulomb lifetimes as the effect of configuration interaction
is rather week (Lu 1974). *nl*
For the higher ionized members of the Mg I sequence there is
generally good agreement between experiment and theory for
the resonance transitions. For higher lying states the
agreement between different experimental values is so poor
that nothing can be said about agreement between theory and
experiment.
*nl2*
References:
*nl**sj*
Froese Fischer C.
Can. J. Phys. _«bs»5_«bs»3 184 (1975a)

Froese Fischer C.
Can. J. Phys. _«bs»5_«bs»3 338 (1975b)

Lindgård A. and Nielsen S. E.
At. Data & Nucl. Data Tables _«bs»1_«bs»9 533 (1977)

Lu K. T.
J. Opt. Soc. Am. _«bs»6_«bs»4 706 (1974)

Weiss A. W.
J. Chem. Phys. _«bs»4_«bs»7 3573 (1967)
*ef*
▶EOF◀