液体的毫米波波段光谱学He II

A. Rybalko, S. Rubets, E. Rudavskii, V. Tikhiy, R. Golovashchenko, V. Derkach, S. Tarapov, O. Usatenko, Y. Poluektov
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引用次数: 0

摘要

电磁场与液氦相互作用的低温实验[1-4]产生了许多有趣和意想不到的结果,这些结果尚未用传统的方式解释。其中一种效应是电磁波在超流氦中的共振吸收和辐射,频率f对应于能谱的旋转间隙ε = Δ/ ε。对于Δ =8.65 K,对应于1.4 K数量级的温度,f = 2πω ω≈180.3 GHz。这种吸收在过渡到超流体状态温度附近的温度依赖性与中子散射实验中得到的质子间隙的温度依赖性完全一致[5,6]。因为在这个频率下光子动量ppt = 3.8 × 103cm−1比旋转动量pr = 1.9 × 108cm−1小很多个数量级,所以在这样的过程中如何遵守动量守恒定律的问题必须得到解决。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Millimeter waveband spectroscopy of liquid He II
Low temperature experiments [1–4] on the interaction of electromagnetic field with liquid helium have produced a number of interesting and unexpected results that have yet to be explained in a conventional manner. One of such effects is the resonance absorption and radiation of electromagnetic waves in superfluid helium at a frequency f corresponding to the roton gap of the energy spectrum, ε = Δ/ħ. For Δ =8.65 K, which corresponds to a temperature of the order of 1.4 K, f = 2πω̃ ≈ 180.3 GHz. The temperature dependence of this absorption near the temperature of transition to superfluid state coincides precisely with temperature dependence of the roton gap obtained in neutron scattering experiments [5, 6]. Since at this frequency the photon momentum ppt = 3.8 × 103 cm−1 is many orders of magnitude smaller than the roton momentum pr = 1.9 × 108 cm−1, the question of how the momentum conservation law can be obeyed in a such process must be addressed.
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