Quantum dynamical simulations of the femtosecond-laser-induced ultrafast desorption of H2 and D2 from Ru(0001).

Quantum dynamical simulations of the femtosecond-laser-induced ultrafast desorption of H2 and D2 from Ru(0001).
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飞秒激光诱导 Ru(0001) 中 H2 和 D2 超快解吸的量子动力学模拟

DOI:
10.1002/cphc.201200940
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发表时间:
2013
期刊:
Chemphyschem : a European journal of chemical physics and physical chemistry
影响因子:
--
通讯作者:
P. Saalfrank
P. Saalfrank
中科院分区:
--
文献类型:
--
作者:
G. Füchsel;J.C. Tremblay;T. Klamroth;P. Saalfrank

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我们研究了飞秒激光脉冲引发的氢和氘在Ru(0001)表面的复合脱附。我们采用一个包含三个分子自由度的量子力学双态模型来描述电子跃迁诱导脱附(DIET)极限内的动力学。利用时能方法详细分析了脱附分子的能量分布、态分辨和系综性质。我们的研究结果揭示了实验观察到的1)大的同位素效应的解吸产率和平移能和2)不平等的能量划分为内部和平移模式。特别是,它示出,一个单一的温度是足以表征的能量分布的所有自由度。此外,我们确认,量子化效应在能量划分的确定中起着重要的作用。
We investigate the recombinative desorption of hydrogen and deuterium from a Ru(0001) surface initiated by femtosecond laser pulses. We adopt a quantum mechanical two‐state model including three molecular degrees of freedom to describe the dynamics within the desorption induced by electronic transition (DIET) limit. The energy distributions as well as the state‐resolved and ensemble properties of the desorbed molecules are analyzed in detail by using the time‐energy method. Our results shed light on the experimentally observed 1) large isotopic effects regarding desorption yields and translational energies and 2) the nonequal energy partitioning into internal and translational modes. In particular, it is shown that a single temperature is sufficient to characterize the energy distributions for all degrees of freedom. Further, we confirm that quantization effects play an important role in the determination of the energy partitioning.
DOI: 10.1103/physrevb.21.3811
发表时间: 1980-01-01
期刊: PHYSICAL REVIEW B
影响因子: 3.7
作者:
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