title: Direct measurements of the ionization potential depression in a dense plasma.
abstract: We have used the Linac Coherent Light Source to generate solid-density aluminum plasmas at temperatures of up to 180 eV. By varying the photon energy of the x rays that both create and probe the plasma, and observing the K-α fluorescence, we can directly measure the position of the K edge of the highly charged ions within the system. The results are found to disagree with the predictions of the extensively used Stewart-Pyatt model, but are consistent with the earlier model of Ecker and Kröll, which predicts significantly greater depression of the ionization potential.
authors.affiliation: Department of Physics, Clarendon Laboratory, University of Oxford, Oxford, United Kingdom.
authors.forename: O
authors.initials: O
authors.lastname: Ciricosta
authors.forename: S M
authors.initials: SM
authors.lastname: Vinko
authors.forename: H-K
authors.initials: HK
authors.lastname: Chung
authors.forename: B-I
authors.initials: BI
authors.lastname: Cho
authors.forename: C R D
authors.initials: CR
authors.lastname: Brown
authors.forename: T
authors.initials: T
authors.lastname: Burian
authors.forename: J
authors.initials: J
authors.lastname: Chalupský
authors.forename: K
authors.initials: K
authors.lastname: Engelhorn
authors.forename: R W
authors.initials: RW
authors.lastname: Falcone
authors.forename: C
authors.initials: C
authors.lastname: Graves
authors.forename: V
authors.initials: V
authors.lastname: Hájková
authors.forename: A
authors.initials: A
authors.lastname: Higginbotham
authors.forename: L
authors.initials: L
authors.lastname: Juha
authors.forename: J
authors.initials: J
authors.lastname: Krzywinski
authors.forename: H J
authors.initials: HJ
authors.lastname: Lee
authors.forename: M
authors.initials: M
authors.lastname: Messerschmidt
authors.forename: C D
authors.initials: CD
authors.lastname: Murphy
authors.forename: Y
authors.initials: Y
authors.lastname: Ping
authors.forename: D S
authors.initials: DS
authors.lastname: Rackstraw
authors.forename: A
authors.initials: A
authors.lastname: Scherz
authors.forename: W
authors.initials: W
authors.lastname: Schlotter
authors.forename: S
authors.initials: S
authors.lastname: Toleikis
authors.forename: J J
authors.initials: JJ
authors.lastname: Turner
authors.forename: L
authors.initials: L
authors.lastname: Vysin
authors.forename: T
authors.initials: T
authors.lastname: Wang
authors.forename: B
authors.initials: B
authors.lastname: Wu
authors.forename: U
authors.initials: U
authors.lastname: Zastrau
authors.forename: D
authors.initials: D
authors.lastname: Zhu
authors.forename: R W
authors.initials: RW
authors.lastname: Lee
authors.forename: P
authors.initials: P
authors.lastname: Heimann
authors.forename: B
authors.initials: B
authors.lastname: Nagler
authors.forename: J S
authors.initials: JS
authors.lastname: Wark