American Chemical Society
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Probing the Superfluid Response of para-Hydrogen with a Sulfur Dioxide Dopant

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posted on 2015-12-16, 23:10 authored by Tao Zeng, Grégoire Guillon, Joshua T. Cantin, Pierre-Nicholas Roy
We recently presented the first attempt at using an asymmetric top molecule (para-water) to probe the superfluidity of nanoclusters (of para-hydrogen) [Zeng, T.; Li, H.; Roy, P.-N. J. Phys. Chem. Lett. 2013, 4, 18−22]. Unfortunately, para-water could not be used to probe the para-hydrogen superfluid response. We now report a theoretical simulation of sulfur dioxide rotating in para-hydrogen clusters and show that this asymmetric top can serve as a genuine probe of superfluidity. With this probe, we predict that as few as four para-hydrogen molecules are enough to form a superfluid cluster, the smallest superfluid system to date. We also propose the concept of “exchange superfluid fraction” as a more precise measurement. New superfluid scenarios brought about by an asymmetric top dopant and potential experimental measurements are discussed.