Hartmann M, Miller RE, Toennies JP, Vilesov AF
Max-Planck-Institut fur Stromungsforschung, Bunsenstrasse 10, D-37073 Gottingen, Germany.
Science. 1996 Jun 14;272(5268):1631-4. doi: 10.1126/science.272.5268.1631.
Small van der Waals clusters of sulfur hexafluoride (SF6) and mixed SF6-rare gas clusters were prepared inside large droplets of helium-4, with each droplet consisting of about 4000 helium atoms. A diode laser was used to measure the high-resolution infrared spectra of these clusters in the vicinity of the nu3 vibrational mode. In all cases rotational structure was observed, indicating that the embedded species rotate nearly freely, although they had been cooled to a temperature of 0.37 kelvin. The results indicate that helium droplets are probably superfluid and thereby provide a uniquely cold yet gentle matrix for high-resolution spectroscopy.
在由约4000个氦原子组成的每个氦 - 4大液滴内部制备了六氟化硫（SF6）的小范德华簇以及混合的SF6 - 稀有气体簇。使用二极管激光器测量这些簇在ν3振动模式附近的高分辨率红外光谱。在所有情况下都观察到了转动结构，这表明尽管嵌入的物质已被冷却到0.37开尔文的温度，但它们几乎可以自由旋转。结果表明氦液滴可能是超流体，从而为高分辨率光谱学提供了一个独特的极冷而温和的基质。
