金属阿秒光电子能谱学中的次级电子级联
Secondary electron cascade in attosecond photoelectron spectroscopy from metals
摘要：
阿秒光谱目前仅限于100 eV左右的光子能量。我们表明，在这些条件下，电子-电子散射，作为光电子离开金属引起的低能量的次级电子的尾巴，因此一个显着的背景。我们开发了一个分析模型的基础上近似解玻尔兹曼的输运方程，占这些次级电子的数量和能量分布。我们的理论与最近的阿秒拖尾实验中发现的电子能谱符合得很好。为了抑制背景并获得更高的能量分辨率，更高能量的光子源可能是有利的。
英文摘要：
Attosecond spectroscopy is currently restricted to photon energies around 100 eV. We show that under these conditions, electron-electron scatterings, as the photoelectrons leave the metal give rise to a tail of secondary electrons with lower energies and hence a significant background. We develop an analytical model based on an approximate solution to Boltzmann's transport equation, to account for the amount and energy distribution of these secondary electrons. Our theory is in good agreement with the electron spectrum found in a recent attosecond streaking experiment. To suppress the background and gain higher energy resolution, photon sources of higher energy could be advantageous.
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