高X射线自由电子激光通量下软X射线发射的再吸收
Reabsorption of soft x-ray emission at high x-ray free-electron laser fluences.
作者信息
Schreck Simon, Beye Martin, Sellberg Jonas A, McQueen Trevor, Laksmono Hartawan, Kennedy Brian, Eckert Sebastian, Schlesinger Daniel, Nordlund Dennis, Ogasawara Hirohito, Sierra Raymond G, Segtnan Vegard H, Kubicek Katharina, Schlotter William F, Dakovski Georgi L, Moeller Stefan P, Bergmann Uwe, Techert Simone, Pettersson Lars G M, Wernet Philippe, Bogan Michael J, Harada Yoshihisa, Nilsson Anders, Föhlisch Alexander
机构信息
Institute for Methods and Instrumentation for Synchrotron Radiation Research, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Strasse 15, 12489 Berlin, Germany and Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany.
Institute for Methods and Instrumentation for Synchrotron Radiation Research, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Strasse 15, 12489 Berlin, Germany.
出版信息
Phys Rev Lett. 2014 Oct 10;113(15):153002. doi: 10.1103/PhysRevLett.113.153002. Epub 2014 Oct 6.
We report on oxygen K-edge soft x-ray emission spectroscopy from a liquid water jet at the Linac Coherent Light Source. We observe significant changes in the spectral content when tuning over a wide range of incident x-ray fluences. In addition the total emission yield decreases at high fluences. These modifications result from reabsorption of x-ray emission by valence-excited molecules generated by the Auger cascade. Our observations have major implications for future x-ray emission studies at intense x-ray sources. We highlight the importance of the x-ray pulse length with respect to the core-hole lifetime.
我们报告了在直线加速器相干光源处对液态水射流进行的氧 K 边软 X 射线发射光谱研究。我们观察到，在大范围的入射 X 射线注量下进行调谐时，光谱内容发生了显著变化。此外，在高注量下总发射产率会降低。这些变化是由俄歇级联产生的价态激发分子对 X 射线发射的再吸收所致。我们的观察结果对未来在强 X 射线源处进行的 X 射线发射研究具有重要意义。我们强调了 X 射线脉冲长度相对于芯孔寿命的重要性。
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