Direct Measurements of the Ionization Potential Depression in a Dense Plasma

作者：Ciricosta O; Vinko S M; Chung H K; Cho B I; Brown C R D; Burian T; Chalupsky J; Engelhorn K; Falcone R W; Graves C; Hajkova V; Higginbotham A; Juha L; Krzywinski J; Lee H J; Messerschmidt M; Murphy C D; Ping Y; Rackstraw D S; Scherz A; Schlotter W; Toleikis S; Turner J J; Vysin L; Wang T; Wu B; Zastrau U; Zhu D; Lee R W; Heimann P; Nagler B; Wark J S^*

来源：Physical Review Letters, 2012, 109(6): 065002.

DOI：10.1103/PhysRevLett.109.065002

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-alpha 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 Kroll, which predicts significantly greater depression of the ionization potential.

• 出版日期2012-8-6