Electron kinetics in liquid water excited by a femtosecond VUV laser pulse
Electron kinetics in liquid water excited by a femtosecond VUV laser pulse
复制标题
飞秒 VUV 激光脉冲激发液态水中的电子动力学
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
B. Rethfeld
中科院分区：
文献类型：
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作者：
K. Huthmacher;N. Medvedev;B. Rethfeld
我们数值模拟了超短真空紫外激光脉冲（半高宽= 10 fs，光子能量为100 eV）与液态水的相互作用。入射激光光子通过电离水分子并产生自由电子与水相互作用。这些激发的电子被水分子弹性散射，并能够通过电离产生二次电子。为了跟踪每个自由电子及其碰撞事件，我们使用类似于（N。梅德韦杰夫和B。Rethfeld，Transient dynamics of the electronic subsystem of semiconductor irradiated with an ultrashort vacuum ultraviolet laser pulse，New Journal of Physics，Vol.12，p.073037（2010））。这种方法使我们能够描述飞秒时间尺度上的瞬态非平衡行为的激发电子。我们提出了瞬态电子能量分布和时间分辨的能量转移，即：激发电子的动能变化、空穴能量的增加以及水分子通过弹性碰撞的激发。我们比较不同的模型得到的结果在液态水的能级：无论是假设致密的水蒸气或带隙的非晶半导体。
We model numerically the interaction of an ultrashort VUV laser pulse (FWHM = 10 fs, photon energy of 100 eV) with liquid water. The incident laser photons interact with water by ionizing water molecules and creating free electrons. These excited electrons are elastically scattered by water molecules and are able to produce secondary electrons via ionization. To track each free electron and its collisions event by event, we use the Monte Carlo method similar to (N. Medvedev and B. Rethfeld, Transient dynamics of the electronic subsystem of semiconductors irradiated with an ultrashort vacuum ultraviolet laser pulse, New Journal of Physics, Vol. 12, p. 073037 (2010)). This approach allows us to describe the transient non-equilibrium behaviour of excited electrons on femtosecond time scales. We present transient electron energy distributions and a time resolved energy transfer, i.e.: the changing kinetic energy of excited electrons, the increase of the energy of holes, and excitation of water molecules via elastic collisions. We compare results obtained with different models for the energy levels in liquid water: either assuming dense water vapour or an amorphous semiconductor with a band gap.
影响因子：
35
作者：
Ackermann, W.;Asova, G.;Zapfe, K.
通讯作者：
Zapfe, K.
影响因子：
8.6
作者：
Medvedev, N.;Zastrau, U.;Rethfeld, B.
通讯作者：
Rethfeld, B.