Atomic Auger Doppler effects upon emission of fast photoelectrons
Atomic Auger Doppler effects upon emission of fast photoelectrons
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DOI：
10.1038/ncomms5069
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发表时间：
2014-06
影响因子：
16.6
通讯作者：
M. Simon;R. Püttner;T. Marchenko;R. Guillemin;R. Kushawaha;L. Journel;G. Goldsztejn;M. Piancastelli;J. Ablett;J. Rueff;D. Céolin
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文献类型：
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作者：
M. Simon;R. Püttner;T. Marchenko;R. Guillemin;R. Kushawaha;L. Journel;G. Goldsztejn;M. Piancastelli;J. Ablett;J. Rueff;D. Céolin
由于最近仪器的实质性改进，硬x射线诱导的光电发射过程的研究，包括高能电子的产生，已经变得可行。在这种新体制下，研究新的动力学现象成为可能。在这里，我们显示了在氖光电离后俄歇发射的显著变化，我们将其归因于由快速光电子的发射引起的氖离子的反冲。由于电离后的Ne原子沿两个相反方向的优先运动，出现了俄歇多普勒频移，表现为俄歇谱特征逐渐变宽和加倍。这种俄歇多普勒效应应该是孤立原子和分子高能光电发射中的一种普遍现象，在研究其他反冲效应（如分子中的振动或旋转反冲）时必须考虑到这一点，并且在固体测量中也可能产生后果。
Studies of photoemission processes induced by hard X-rays including production of energetic electrons have become feasible due to recent substantial improvement of instrumentation. Novel dynamical phenomena have become possible to investigate in this new regime. Here we show a significant change in Auger emission following 1sphotoionization of neon, which we attribute to the recoil of the Ne ion induced by the emission of a fast photoelectron. Because of the preferential motion of the ionized Ne atoms along two opposite directions, an Auger Doppler shift is revealed, which manifests itself as a gradual broadening and doubling of the Auger spectral features. This Auger Doppler effect should be a general phenomenon in high-energy photoemission of both isolated atoms and molecules, which will have to be taken into account in studies of other recoil effects such as vibrational or rotational recoil in molecules, and may also have consequences in measurements in solids.