Towards new regimes of lattice dynamics using femtosecond time-resolved x-ray scattering

提出了研制高平均x射线通量的激光驱动飞秒keV x射线源的设想。这样的x射线脉冲将为利用弹性和非弹性x射线散射研究晶格动力学开辟新的途径。强烈的光激发将被用来驱动强晶格激发，导致晶格原子从它们的平衡位置产生大量的偏移。这些研究将为激光激发固体中的能量松弛提供新的信息，并揭示可能最终导致材料结构变化的特定相干晶格激发。

It is proposed to develop a laser-driven, femtosecond, keV x-ray source of high average x-ray flux. Such x-ray pulses will open up new regimes of study in lattice dynamics using elastic and inelastic x-ray scattering. Intense optical excitation will be used to drive strong lattice excitations leading to substantial excursions of the lattice atoms from their equilibrium position. These investigations will provide new information on the energy relaxation in laser-excited solids and shed light on specific coherent lattice excitations that may eventually lead to structural changes of the material.