Tamasaku Kenji, Ishikawa Tetsuya
RIKEN SPring-8 Center, 1-1-1 Koto, Sayo-gun, Hyogo 679-5148 Japan.
Phys Rev Lett. 2007 Jun 15;98(24):244801. doi: 10.1103/PhysRevLett.98.244801. Epub 2007 Jun 14.
Parametric down-conversion of x rays into extreme ultraviolet and accompanying nonlinear x-ray diffraction were investigated both theoretically and experimentally. The theory predicted a rocking curve having a Lorentzian signal peak; however, the experiments revealed a peak followed by an unexpected dip. Together with the scattering angle dependence of the signal, the experimental results implied a possibility of interference between the Compton scattering and the parametric down-conversion. The similarity to the Fano effect is discussed.
对X射线到极紫外的参量下转换以及伴随的非线性X射线衍射进行了理论和实验研究。理论预测了一个具有洛伦兹信号峰的摇摆曲线；然而，实验揭示了一个峰后面跟着一个意外的凹陷。结合信号的散射角依赖性，实验结果暗示了康普顿散射和参量下转换之间存在干涉的可能性。讨论了与法诺效应的相似性。
