Multiphoton Dissociation and Ionization Dynamics of Allyl Chloride Using Femtosecond Laser Pulses

The dissociation and photoionization dynamics of C3H5Cl were studied at 200, 400, and 800 nm.with femtosecond laser pulses. The time-of-flight mass spectra, laser power index and photoelectron images.were recorded. At short wavelength (200 nm), ionization of the parent molecule was found to be the dominant.channel, while other ions were generated by the dissociation of C3H5Cl+. With the shift to long wavelength.(e.g., 800 nm), fragment ions became dominant, and were generated through the multiphoton ionization of.neutral fragments after the photodissociation of C3H5Cl. These results imply that photodissociation plays a.significant role at long wavelength, because neutral fragments are supposed to be generated from the.intermediate states reached by 800 nm photons. At 400 nm, the dissociation on the intermediate states is also.critical, but is not as high as that at 800 nm. Taken together, our results demonstrate that the dissociation/.ionization behaviors of allyl chloride are wavelength-dependent, and reveal the complex dynamics of allyl.chloride at 200, 400 and 800 nm.

利用飞秒激光脉冲在200、400和800纳米处研究了C₃H₅Cl的解离和光电离动力学。记录了飞行时间质谱、激光功率指数和光电子图像。在短波长（200纳米）处，发现母体分子的电离是主要通道，而其他离子是由C₃H₅Cl⁺解离产生的。随着波长变长（例如800纳米），碎片离子变得占主导地位，并且是在C₃H₅Cl光解后通过中性碎片的多光子电离产生的。这些结果表明，光解在长波长处起着重要作用，因为预计中性碎片是由800纳米光子所达到的中间态产生的。在400纳米处，中间态的解离也很关键，但不如在800纳米处那么高。总之，我们的结果表明，烯丙基氯的解离/电离行为与波长有关，并揭示了烯丙基氯在200、400和800纳米处的复杂动力学。