Jiang S, Lazicki A E, Hansen S B, Sterne P A, Grabowski P, Shepherd R, Scott H A, Smith R F, Eggert J H, Ping Y
Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
Sandia National Laboratory, Albuquerque, New Mexico 87185, USA.
Phys Rev E. 2020 Feb;101(2-1):023204. doi: 10.1103/PhysRevE.101.023204.
We report measurements of K-shell fluorescence lines induced by fast electrons in ramp-compressed Co targets. The fluorescence emission was stimulated by fast electrons generated through short-pulse laser-solid interaction with an Al target layer. Compression up to 2.1× solid density was achieved while maintaining temperatures well below the Fermi energy, effectively removing the thermal effects from consideration. We observed small but unambiguous redshifts in the Kβ fluorescence line relative to unshifted Cu Kα. Redshifts up to 2.6 eV were found to increase with compression and to be consistent with predictions from self-consistent models based on density-functional theory.
我们报告了在斜坡压缩的钴靶中由快电子诱导产生的K壳层荧光线的测量结果。荧光发射是由与铝靶层的短脉冲激光-固体相互作用产生的快电子激发的。在将温度保持在远低于费米能的情况下实现了高达2.1倍固体密度的压缩，从而有效地消除了热效应的影响。我们观察到，相对于未发生位移的铜Kα线，Kβ荧光线存在虽小但明确的红移。发现高达2.6电子伏特的红移随压缩程度增加，并且与基于密度泛函理论的自洽模型的预测结果一致。
