The effect of negative ions on the dust acoustic wave in dusty electronegative plasma with positively charged dust grains

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• 作者：Yunliang Wang^a ; ^{ylwang@ustb.edu.cn} ; Xiangqian Jiang^b ; Chunxia Guo^a ; Zhongxiang Zhou^b
• 关键词：Dusty plasma ; Negative ions ; Nonadiabatic dust charge variation
• 刊名：Physics Letters A
• 出版年：2011
• 出版时间：24 January 2011
• 年：2011
• 卷：375
• 期：4
• 页码：832-838
• 全文大小：568 K

文摘

The effect of negative ions on the modulational instability properties of nonlinear dust acoustic (DA) waves in the electronegative dusty plasmas was investigated by considering Boltzmann-distributed electrons, negative ions, positive ions as well as positively charged dust grain under the ultraviolet irradiation. It is shown that the modulational instability properties of the DA waves were strongly affected by the temperature and proportion of negative ions. The modulational instability can occur only if the proportion of negative ions was smaller than critical value. The instability growth rate has a maximum value when the proportion of negative ions was a critical one in the unstable region. The effect of photoelectron generated by ultraviolet irradiation on the modulational instability of dust acoustic waves was also discussed by numerical method.