飞秒脉冲作用下氯丙烯的多光子解离和电离动力学（英文）

发布时间：2018-03-21 22:11

本文选题：飞秒激光脉冲　切入点：飞行时间质谱　出处：《物理化学学报》2017年03期 　论文类型：期刊论文

【摘要】：利用飞秒激光脉冲,在200、400和800 nm下对氯丙烯(C_3H_5Cl)的光解离和电离动力学进行了研究。实验测量了氯丙烯在飞秒脉冲作用下的飞行时间质谱、光强指数以及光电子影像。结果发现在短波(200 nm)时,母体分子的电离为主要通道,而其他离子均来源于C_3H_5Cl~+的解离。当波长移动到长波(800 nm)时,碎片离子就占据了主导。这些碎片离子来源于中性碎片的多光子电离过程,而这些中性碎片又是由C_3H_5Cl的中间态直接解离而产生的。这意味着,光解离过程起到非常重要的作用。这是因为800 nm可以激发分子达到能够产生中性碎片的中间态。在400 nm时,虽然中间态的解离过程仍然至关重要,但并没有在800 nm时明显。综上所述,本文的研究证实了氯丙烯的光解离/电离行为具有波长依赖性,并揭示了氯丙烯在200、400和800 nm飞秒激光作用下的复杂动力学过程。
[Abstract]:By using femtosecond laser pulses, at 200400 and 800 nm of allyl chloride (C_3H_5Cl) light dissociation and ionization kinetics were studied. The time of flight mass spectrometry were measured in allyl chloride under the effect of femtosecond pulse, intensity index and photoelectron imaging. The results found in HF (200 nm), as the main ionization of the parent molecule the channel, while other ions are derived from the dissociation of C_3H_5Cl~+. When the wavelength shifts to long wavelength (800 nm), fragment ions occupied leading. These fragment ions from neutral fragments of the multiphoton ionization process, and these neutral fragments and is produced by direct dissociation of intermediate C_3H_5Cl. This means that the photodissociation process plays a very important role. This is because the 800 nm can reach the intermediate state of excited molecules can produce neutral fragments. In 400 nm, while the dissociation process of intermediate state still vital, but did not It is obvious at 800 nm. In conclusion, this study confirms the wavelength dependence of the photodissociation / ionization behavior of allyl chloride, and reveals the complex dynamic process of allyl chloride under the action of 200400 and 800 nm femtosecond laser.

【作者单位】：华中农业大学理学院;华中农业大学应用物理研究所;
【基金】：supported by the National Natural Science Foundation of China(21403080,61308028) Specialized Research Fund for the Doctoral Program of Higher Education,China(20130146120015)~~
【分类号】：O623.221

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