Momentum imaging spectrometer for molecular fragmentation dynamics induced by pulsed electron beam.

Momentum imaging spectrometer for molecular fragmentation dynamics induced by pulsed electron beam.
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用于脉冲电子束诱导的分子碎裂动力学的动量成像光谱仪。

DOI:
10.1063/1.4847156
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发表时间:
2013-12
影响因子:
1.6
通讯作者:
Chen, Xiangjun
Chen, Xiangjun
中科院分区:
工程技术4区
文献类型:
--
作者:
Wang, Enliang;Shan, Xu;Shi, Yufeng;Tang, Yaguo;Chen, Xiangjun

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建立了一台用于研究电子碰撞分子碎裂动力学的动量成像光谱仪。该装置包括一个脉冲电子枪和飞行时间系统,以及一个二维的时间和位置敏感的多击中探测器。在4π立体角范围内可以探测到动能高达10 eV的带电碎片,并可以重建它们的三维动量矢量。该装置通过Ar的电子碰撞电离和CO2的解离电离进行了测试。通过对离子-离子符合谱的分析,确定了CO2(2+)和CO2(3+)的完全和不完全库仑碎裂通道。报道了二体破碎通道CO2(2+*)→ O(+)+ CO(+)的动能释放(KER)和角关联。总KER的峰值为6.8 eV,与之前的光离子-光离子符合研究一致,O(+)和CO(+)的相关角也明确确定为172.5°。
A momentum imaging spectrometer has been built for studying the electron impact molecular fragmentation dynamics. The setup consists of a pulsed electron gun and a time of flight system as well as a two-dimensional time and position sensitive multi-hit detector. The charged fragments with kinetic energy up to 10 eV can be detected in 4π solid angles and their three-dimensional momentum vectors can be reconstructed. The apparatus is tested by electron impact ionization of Ar and dissociative ionization of CO2. By analyzing the ion-ion coincidence spectra, the complete and incomplete Coulomb fragmentation channels for CO2(2+) and CO2(3+) are identified. The kinetic energy release (KER) and angular correlation for the two-body breakup channel CO2(2+*) → O(+) + CO(+) are reported. The peak value of total KER is found to be 6.8 eV which is consistent with the previous photoion-photoion coincidence studies, and the correlation angle of O(+) and CO(+) is also explicitly determined to be 172.5°.
DOI: 10.1088/0953-4075/38/9/025
发表时间: 2005-04
期刊: Journal of Physics B: Atomic, Molecular and Optical Physics
影响因子: --
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