论文标题
激光诱导的电子菲涅耳衍射，XUV脉冲以极高的强度
Laser-induced electron Fresnel diffraction by XUV pulses at extreme intensity
论文作者
论文摘要
激光场中原子和分子的电离可以导致光电子光谱中各种有趣的干扰结构。对于超强度极端紫外线激光脉冲的情况，我们沿着激光场传播的方向确定了电子动量分布中的新型花瓣样干扰结构。我们表明，这种结构是相当一般的，可以归因于细胞核电子波袋的菲涅尔衍射。我们的结果通过数值求解原子氢的时间依赖性的schrodinger方程超出偶极子近似。通过构建分析模型，我们发现电子位移决定了上述干扰模式。此外，我们还建立了激光诱导的电子菲涅耳衍射的物理图片，该衍射均通过量子和半经典模型增强。
Ionization of atoms and molecules in laser fields can lead to various interesting interference structures in the photoelectron spectrum. For the case of a super-intense extreme ultraviolet laser pulse, we identify a novel petal-like interference structure in the electron momentum distribution along the direction of the laser field propagation. We show that this structure is quite general and can be attributed to the Fresnel diffraction of the electronic wavepacket by the nucleus. Our results are demonstrated by numerically solving the time-dependent Schrodinger equation of the atomic hydrogen beyond the dipole approximation. By building an analytical model, we find that the electron displacement determines the aforementioned interference pattern. In addition, we establish the physical picture of laser-induced electron Fresnel diffraction which is reinforced by both quantum and semiclassical models.
