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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Alignment of ethyl halide molecules (C2H5X, X= I, Br, Cl) induced by strong ps laser irradiation
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Alignment of ethyl halide molecules (C2H5X, X= I, Br, Cl) induced by strong ps laser irradiation

机译：强ps激光辐照诱导的卤化乙基分子（C2H5X，X = I，Br，Cl）的排列

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摘要

The alignment of polyatomic molecules under strong 35 ps laser irradiation is investigated for a broad range of laser intensities (10(13)-10(15) W/cm(2)) using time-of-flight mass spectrometry. The dynamic alignment of the molecules under study (C2H5X, X = I, Br, Cl) is verified in single-pulse experiments by recording the fragments' angular distributions, their dependence on the laser intensity, and also the comparison of the ionic signal of the various fragments recorded for linear and circular polarization. For all cases, the angular distributions of the Coulomb explosion fragments are found to be independent of the laser peak intensity, implying that the molecular alignment is taking place during the rise time of the laser pulses at relatively low intensities (1011 W/cm(2)). Moreover, the same result implies that the alignment mechanism is close to the adiabatic limit, albeit the laser pulse duration is much shorter than the characteristic rotational times (1/2B) of the molecules under study. Finally, by comparing the angular distributions of the different molecules, we conclude that the degree of alignment is only weakly dependent on the molecular mass and the moment of inertia under the irradiation conditions applied.
机译：使用飞行时间质谱法研究了在35 ps的强激光照射下多原子分子的排列，可在较宽的激光强度范围（10（13）-10（15）W / cm（2））中进行研究。在单脉冲实验中，通过记录碎片的角度分布，它们对激光强度的依赖性以及离子对的离子信号的比较，可以验证所研究分子（C2H5X，X = I，Br，Cl）的动态排列。记录了线性和圆极化的各种片段。在所有情况下，库仑爆炸碎片的角分布都与激光峰值强度无关，这意味着在激光脉冲的上升时间内以相对较低的强度（1011 W / cm（2 ））。此外，尽管激光脉冲的持续时间比所研究分子的特征旋转时间（1 / 2B）短得多，但相同的结果也暗示了排列机制接近绝热极限。最后，通过比较不同分子的角分布，我们得出结论，在所施加的辐照条件下，取向度仅弱取决于分子质量和惯性矩。

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