Issue |
Astron. Astrophys. Suppl. Ser.
Volume 122, Number 1, April I 1997
|
|
---|---|---|
Page(s) | 157 - 161 | |
DOI | https://doi.org/10.1051/aas:1997298 | |
Published online | 15 April 1997 |
Absolute transition probabilities for the a6D
y6P° multiplet (#8) of Fe II
Department of Physics, University of Wisconsin-Madison, Madison, WI 53706, U.S.A.
Send offprint request to: K.L. Mullman
Received:
13
May
1996
Accepted:
2
July
1996
We report the first laboratory measurement of absorption oscillator
strengths (f-values) for 6 VUV ()
transitions of the
multiplet (#8) in Fe II. We have also
reconfirmed a recent measurement of the f-value of the Fe II resonance
line at
. These measurements are made
with the high sensitivity absorption experiment at the University of
Wisconsin-Madison. Measurements are also made on UV (
) lines in Fe II with accurately known f-values in order
to construct a reliable curve of growth for the experiment. Diffusive
cooling of
ions in the negative glow of the hollow cathode
discharge, which serves as an absorbing sample, results in a
non-Maxwellian ion velocity distribution. A satisfactory curve of growth
is generated using a full Voigt profile with an artificially low ion
temperature in some cases.
Key words: atomic data / ISM: abundances / ISM: atoms / ultraviolet: general / Sun: abundances
© European Southern Observatory (ESO), 1997