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首页> 外文期刊>RSC Advances >Dissociative ionization and Coulomb explosion of ethyl bromide under a near-infrared intense femtosecond laser field
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Dissociative ionization and Coulomb explosion of ethyl bromide under a near-infrared intense femtosecond laser field

机译：近红外强飞秒激光场下乙基的离解电离和库仑爆炸

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摘要

The multi-photon dissociation and Coulomb explosion of ethyl bromide C2H5Br under near-infrared (800 nm) femtosecond laser field are experimentally investigated by a DC-sliced ion imaging technique. The sliced images of fragment ions C2H5+, Br+, CH3+, CH2Br+, H-2(+) and C2H3Br+ are obtained, and their dissociative pathways are assigned by observing their corresponding kinetic energy release (KER) and angular distribution. It is shown that low-KER components of these fragment ions result from multi-photon dissociation of singly charged parent ion C2H5Br+, while high-KER components come from Coulomb explosion of doubly charged parent ion C2H5Br2+. It is also shown that the precursor species [C2H5+center dot center dot center dot Br+] has a longer lifetime than [C2H3Br+center dot center dot center dot H-2(+)] and [CH3 center dot center dot center dot CH2Br+]. In addition, the probable H-2 and H-2(+) elimination channels are theoretically simulated by Gaussian 09 software packages, and the results show that the former is an asynchronous process while the latter is a synchronous process.
机译：通过直流切片离子成像技术，对近红外（800 nm）飞秒激光场下乙基溴C2H5Br的多光子解离和库仑爆炸进行了实验研究。获得了碎片离子C2H5 +，Br +，CH3 +，CH2Br +，H-2（+）和C2H3Br +的切片图像，并通过观察其相应的动能释放（KER）和角度分布来指定其离解途径。结果表明，这些碎片离子的低KER组分来自单电荷母离子C2H5Br +的多光子解离，而高KER组分来自双电荷母离子C2H5Br2 +的库仑爆炸。还显示，前体物质[C2H5 +中心点中心点中心点Br +]的寿命比[C2H3Br +中心点中心点中心点H-2（+）]和[CH3中心点中心点中心点CH2Br +]长。 ]。此外，用高斯09软件包在理论上模拟了可能的H-2和H-2（+）消除通道，结果表明，前者是一个异步过程，而后者是一个同步过程。

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