Heinrich J, Kim S-H, Merlino R L
Department of Physics and Astronomy, The University of Iowa, Iowa City, Iowa 52242, USA.
Phys Rev Lett. 2009 Sep 11;103(11):115002. doi: 10.1103/PhysRevLett.103.115002.
Repeated, self-excited dust acoustic shock waves (DASWs) have been observed in a dc glow discharge dusty plasma using high-speed video imaging. Two major observations are reported: (1) The self-steepening of a nonlinear dust acoustic wave (DAW) into a saw-tooth wave with sharp gradient in dust density, very similar to those found in numerical solutions of the fully nonlinear fluid equations for a nondispersive DAW [B. Eliasson and P. K. Shukla, Phys. Rev. E 69, 067401 (2004)], and (2) the collision and confluence of two DASWs.
利用高速视频成像技术，在直流辉光放电尘埃等离子体中观测到了重复的自激尘埃声波（DASW）。报道了两项主要观测结果：（1）非线性尘埃声波（DAW）自陡峭形成具有尖锐尘埃密度梯度的锯齿波，这与非色散DAW的完全非线性流体方程数值解中发现的情况非常相似[B. Eliasson和P. K. Shukla，《物理评论E》69，067401（2004）]，以及（2）两个DASW的碰撞和合并。
