Hydrogen clusters that remain fluid at low temperature.
Hydrogen clusters that remain fluid at low temperature.
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在低温下保持液态的氢簇。
DOI：
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发表时间：
2008
影响因子：
8.6
通讯作者：
A. Vilesov
中科院分区：
文献类型：
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作者：
Kirill Kuyanov;A. Vilesov
30年前预测的氢的超流动性，由于H2在T=13.8 K时的高冻结温度，仍然无法通过实验观察。在低温脉冲自由射流膨胀中获得了大的对h2团簇，并通过非线性拉曼光谱进行了研究。由整齐的ph_{2}形成的星团是固体的，这可以从旋转的S0(0)线的特征分裂中得到证明。然而，在He中高度稀释的ph_{2}（<或= 1%）形成的团簇具有单一的S0(0)线，并且在估计的超流体转变温度T=1-2 K下保持液态。
Superfluidity of hydrogen, predicted three decades ago, continues to elude experimental observation, due to the high freezing temperature of H2 at T=13.8 K. Here, large para-H2 clusters are obtained in a cryogenic pulsed free jet expansion and are studied via nonlinear Raman spectroscopy. Clusters formed from neat pH_{2} are solid as evidenced by the characteristic splitting of the rotational S0(0) line. However, clusters formed of highly diluted pH_{2} (< or = 1%) in He have a single S0(0) line and remain liquid at the estimated superfluid transition temperature of T=1-2 K.