Detailed model study of dissipative quantum dynamics of K2 attached to helium nanodroplets

Detailed model study of dissipative quantum dynamics of K2 attached to helium nanodroplets
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附着在氦纳米液滴上的 K2 耗散量子动力学的详细模型研究

DOI:
10.1088/1367-2630/14/1/013029
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发表时间:
2012
影响因子:
3.3
通讯作者:
W.T. Strunz
W.T. Strunz
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
M. Schlesinger;W.T. Strunz

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我们彻底研究了附着在He液滴上的二聚体的振动量子动力学,其动机是最近对K2的测量(Claas et al 2006 J. Phys. B:At.摩尔39 S1151)。对于那些飞秒泵浦-探测实验,气相计算不能再现关键的观察到的特征,但是使用基于耗散量子动力学的描述发现了一致性,如Schlesinger等人(2010 Chem. Phys. Lett. 490 245-8)。在这里,我们提出了一个详细的研究液滴引起的可能影响的影响。氦滴引起电子退相干、势面移动和波包弛豫。此外,一个现实的描述(随机)解吸的二聚体的液滴需要考虑。一步一步,我们包括和研究这些影响的重要性,在我们的有效二聚体动力学的全量子计算。这种方法使我们能够重现和解释所有主要的实验发现。我们发现,解吸是快速的,发生在电子激发后2-10 ps。另一个发现是,在基态的慢振动运动可以被认为是无摩擦的。
We thoroughly investigate vibrational quantum dynamics of dimers attached to He droplets, motivated by recent measurements with K 2 (Claas et al 2006 J. Phys. B: At. Mol. Opt. Phys. 39 S1151). For those femtosecond pump–probe experiments, the crucial observed features are not reproduced by gas-phase calculations, but agreement is found using a description based on dissipative quantum dynamics, as briefly shown in the work by Schlesinger et al (2010 Chem. Phys. Lett. 490 245–8). Here we present a detailed study of the influence of possible effects induced by the droplet. The helium droplet causes electronic decoherence, shifts of potential surfaces and relaxation of wave packets in attached dimers. Moreover, a realistic description of (stochastic) desorption of dimers off the droplet needs to be taken into account. Step by step, we include and study the importance of these effects in our full quantum calculation of the effective dimer dynamics. This approach allows us to reproduce and explain all major experimental findings. We find that desorption is fast and occurs within 2–10 ps after electronic excitation. A further finding is that slow vibrational motion in the ground state can be considered frictionless.
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