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.
Lawrence Livermore National Laboratory, University of California, Livermore, CA 94551, USA.
M E
ME
Foord
R F
RF
Heeter
P A M
PA
van Hoof
R S
RS
Thoe
J E
JE
Bailey
M E
ME
Cuneo
H-K
HK
Chung
D A
DA
Liedahl
K B
KB
Fournier
G A
GA
Chandler
V
V
Jonauskas
R
R
Kisielius
L P
LP
Mix
C
C
Ramsbottom
P T
PT
Springer
F P
FP
Keenan
S J
SJ
Rose
W H
WH
Goldstein