Institute of Experimental Physics, TU Graz, Petersgasse 16, A-8010 Graz, Austria.
J Chem Phys. 2010 Oct 28;133(16):164502. doi: 10.1063/1.3500397.
Alkali-metal atoms captured on the surface of superfluid helium droplets are excited to high energies (≈3 eV) by means of pulsed lasers, and their laser-induced-fluorescence spectra are recorded. We report on the one-photon excitation of the (n+1)p←ns transition of K, Rb, and Cs (n=4, 5, and 6, respectively) and on the two-photon one-color excitation of the 5d←5s transition of Rb. Gated-photon-counting measurements are consistent with the relaxation rates of the bare atoms, hence consistent with the reasonable expectation that atoms quickly desorb from the droplet and droplet-induced relaxation need not be invoked.
碱金属原子被捕获在超流氦液滴的表面上，然后通过脉冲激光将其激发到高能态（约 3eV），并记录它们的激光诱导荧光光谱。我们报告了 K、Rb 和 Cs（n=4、5 和 6 分别）的（n+1)p←ns 跃迁的单光子激发，以及 Rb 的 5d←5s 跃迁的双光子单颜色激发。门控光子计数测量结果与裸原子的弛豫率一致，因此与原子快速从液滴中解吸的合理预期一致，无需引入液滴诱导的弛豫。
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