Boltnev Roman E, Vasiliev Mikhail M, Kononov Evgenii A, Petrov Oleg F
Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow, 125412, Russia.
Branch of Talrose Institute for Energy Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russia.
Sci Rep. 2019 Mar 1;9(1):3261. doi: 10.1038/s41598-019-40111-w.
A multimodal dusty plasma formed in a positive column of the direct current glow discharge at superfluid helium temperatures has been studied for the first time. Formation of a liquid-like dusty plasma structure occurred after injection of polydisperse cerium oxide particles in the glow discharge. The coupling parameter ~10 determined for the dusty plasma structure corresponds very well to its liquid-like type. The cloud of nanoparticles and non-linear waves within the cloud were observed at T < 2 K. Solid helical filaments with length up to 5 mm, diameter up to 22 μm, total charges ~10е, levitating in the gas discharge at the temperature ~2 K and pressure 4 Pa have been observed for the first time. Analysis of the experimental conditions and the filament composition allows us to conclude that the filaments and nanoclusters were formed due to ion sputtering of dielectric material during the experiments.
首次对在超流氦温度下直流辉光放电正柱中形成的多模态尘埃等离子体进行了研究。在辉光放电中注入多分散氧化铈颗粒后，形成了类似液体的尘埃等离子体结构。为尘埃等离子体结构确定的耦合参数约为10，与类似液体的类型非常吻合。在T < 2 K时观察到纳米颗粒云及其内部的非线性波。首次观察到长度达5毫米、直径达22微米、总电荷约为10е的实心螺旋丝，它们在约2 K的温度和约4 Pa的压力下悬浮在气体放电中。对实验条件和细丝成分的分析使我们得出结论，细丝和纳米团簇是在实验过程中由于介电材料的离子溅射而形成的。
