Charge-state distribution and Doppler effect in an expanding photoionized plasma
Foord M.E., Heeter R.F., van Hoof P.A.M., Thoe R.S., Bailey J.E.,
Cuneo M.E., Chung H.-K., Liedahl D.A., Fournier K.B., Chandler G.A.,
Jonauskas V., Kisielius R., Mix L.P., Ramsbottom C., Springer P.T.,
Keenan F.P., Rose S.J., Goldstein W.H.
published in: Physical Review Letters, 93, 055002 (2004)
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.
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Peter van Hoof
Royal Observatory of Belgium
Ringlaan 3
1180 Brussel
Belgium
email: p DOT vanhoof AT oma DOT be
