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首页> 外文期刊>Physical review >Bound roton pairs in HeII under pressure: Analysis of Raman spectra
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Bound roton pairs in HeII under pressure: Analysis of Raman spectra

机译：HeII压力下束缚子对：拉曼光谱分析

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We have investigated the properties of bound roton pairs in superfluid He as a function of pressure using Raman scattering. Raman spectra at small energy shifts of 10-30 K were measured at several pressures up to the melting curve. The spectra reveal an asymmetric peak at about 2 times the energy of a roton, consistent with previous works. Our data, as well as previous measurements by Ohbayashi et al., were analyzed according to a model for the two roton density of states. The value of the l=2 component of the interaction energy of a roton pair as a function of pressure was extracted from the analysis and compared with theoretical predictions. We find that this interaction changes sign from attractive to repulsive at pressure around 10 bar. The lifetime of a single roton as a function of temperature was also determined.
机译：我们已经使用拉曼散射研究了超流体He中束缚子对的性质与压力的关系。在高达熔解曲线的数个压力下测量了10-30 K的小能量位移下的拉曼光谱。光谱显示出不对称峰，其能量约为棒子能量的2倍，与以前的工作一致。我们的数据，以及Ohbayashi等人先前的测量，都是根据两种状态的顿数密度模型进行分析的。从分析中提取了一个棒对的相互作用能的l = 2分量的值作为压力的函数，并将其与理论预测值进行了比较。我们发现，在10 bar左右的压力下，这种相互作用将符号从吸引变为排斥。还确定了单个ro头的寿命作为温度的函数。

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