氦纳米液滴表面钾二聚体的波包动力学
Wave packet dynamics of potassium dimers attached to helium nanodroplets
摘要:
利用飞秒泵浦-探测光谱研究了超流氦纳米液滴表面K $_2$二聚体的振动波包动力学。所采用的共振三光子电离方案进行了研究,在很宽的波长范围内,并确定了不同的途径导致K $^+_2$ -形成。虽然电子基态的波包动力学不受氦环境的影响,但观察到电子激发态的扰动。后者揭示了强烈的时间依赖性的时间尺度3-8 ps,这直接反映了动力学的K $_2$的解吸氦液滴。
英文摘要:
The dynamics of vibrational wave packets excited in K$_2$ dimers attached to superfluid helium nanodroplets is investigated by means of femtosecond pump-probe spectroscopy. The employed resonant three-photon-ionization scheme is studied in a wide wavelength range and different pathways leading to K$^+_2$-formation are identified. While the wave packet dynamics of the electronic ground state is not influenced by the helium environment, perturbations of the electronically excited states are observed. The latter reveal a strong time dependence on the timescale 3-8 ps which directly reflects the dynamics of desorption of K$_2$ off the helium droplets.
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