Charge-state distribution and Doppler effect in an expanding photoionized plasma.
The charge state distributions of Fe, Na, and F are determined in a photoionized laboratory plasma using high resolution x-ray spectroscopy. Independent measurements of the density and radiation flux indicate unprecedented values for the ionization parameter xi=20-25 erg cm s(-1) under near steady-state conditions. Line opacities are well fitted by a curve-of-growth analysis which includes the effects of velocity gradients in a one-dimensional expanding plasma. First comparisons of the measured charge state distributions with x-ray photoionization models show reasonable agreement.
Foord
M E
ME
Lawrence Livermore National Laboratory, University of California, Livermore, CA 94551, USA.
Heeter
R F
RF
van Hoof
P A M
PA
Thoe
R S
RS
Bailey
J E
JE
Cuneo
M E
ME
Chung
H-K
HK
Liedahl
D A
DA
Fournier
K B
KB
Chandler
G A
GA
Jonauskas
V
V
Kisielius
R
R
Mix
L P
LP
Ramsbottom
C
C
Springer
P T
PT
Keenan
F P
FP
Rose
S J
SJ
Goldstein
W H
WH