Photoelectron angular distributions from liquid water: effects of electron scattering.
Photoelectron angular distributions from liquid water: effects of electron scattering.
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DOI：
10.1103/physrevlett.111.173005
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发表时间：
2013-10
影响因子：
8.6
通讯作者：
S. Thürmer;R. Seidel;M. Faubel;W. Eberhardt;J. Hemminger;S. Bradforth;B. Winter
中科院分区：
文献类型：
--
作者：
S. Thürmer;R. Seidel;M. Faubel;W. Eberhardt;J. Hemminger;S. Bradforth;B. Winter
报道了水中氧-1S电离的液水表面光电子角分布(PAD)和体液水光电子角分布。尽管没有气相的各向异性大，但当出射电子与其他水分子的弹性散射截面很大时，即使在电子动能低于100 eV的情况下，从液体测得的Pad也是显著的各向异性。PADS显示，在低动能下，非弹性平均自由程的理论估计可能太长，因此在阈值电离附近的电子在水中的探测深度似乎比迄今的假设要小得多。
Photoelectron angular distributions (PADs) from the liquid-water surface and from bulk liquid water are reported for water oxygen-1s ionization. Although less so than for the gas phase, the measured PADs from the liquid are remarkably anisotropic, even at electron kinetic energies lower than 100 eV, when elastic scattering cross sections for the outgoing electrons with other water molecules are large. The PADs reveal that theoretical estimates of the inelastic mean free path are likely too long at low kinetic energies, and hence the electron probing depth in water, near threshold ionization, appears to be considerably smaller than so far assumed.