Correlation between a photoelectron and a fragment ion in dissociative ionization of ethanol in intense near-infrared laser fields
Correlation between a photoelectron and a fragment ion in dissociative ionization of ethanol in intense near-infrared laser fields
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DOI：
10.1063/1.4805085
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发表时间：
2013-05-28
影响因子：
4.4
通讯作者：
Itakura, Ryuji
中科院分区：
文献类型：
--
作者：
Hosaka, Kouichi;Yokoyama, Atsushi;Itakura, Ryuji
用光电子-光离子符合方法研究了近红外激光脉冲（λ = 783 nm）诱导乙醇（C2 H5 OH）的两个解离电离通道：C2 H5 OH-> CH 2 OH + + CH 3 + e（-）和C2 H5 OH-> C2 H5 + + OH + e（-）。结果表明，在光电子发射的瞬间，C_2H_5OH ~+的电子基态和第一电子激发态都产生了。从观察到的C2 H5 OH+在光电子发射时刻的电子态与碎片离子的动能释放之间的相关性，它揭示了在光电子发射时刻的电子基态制备的C2 H5 OH+比在电子激发态制备的C2 H5 OH+在最终获得更大的内能。当激光场强度从9增加到23 TW/cm（2），激光脉宽从35增加到800 fs时，解离前C_2H_5OH ~+的平均内能增加。(C)2013 AIP Publishing LLC.
The two dissociative ionization channels of ethanol (C2H5OH) induced by an intense near-infrared laser pulse (lambda similar to 783 nm), C2H5OH -> CH2OH+ + CH3 + e(-) and C2H5OH -> C2H5+ + OH + e(-), are investigated using photoelectron-photoion coincidence method. It is shown that both the electronic ground state and the first electronically excited state of C2H5OH+ are produced at the moment of photoelectron emission. From the observed correlation between the electronic states of C2H5OH+ prepared at the moment of photoelectron emission and the kinetic energy release of the fragment ions, it is revealed that C2H5OH+ prepared in the electronic ground state at the photoelectron emission gains larger internal energy in the end than that prepared in the electronically excited state. The averaged internal energy of C2H5OH+ just before the dissociation is found to increase when the laser field intensity increases from 9 to 23 TW/cm(2) and when the laser pulse duration increases from 35 to 800 fs. (C) 2013 AIP Publishing LLC.