Design and analysis of doped left-handed materials

We devise three sorts of doped left-handed materials （DLHMs） by introducing inductors and capacitors into the traditional left-handed material （LHM） as heterogeneous elements. Some new properties are presented through finitedifference time-domain （FDTD） simulations. On the one hand, the resonance in the traditional LHM is weakened and the original pass band is narrowed by introducing inductors. On the other hand, the original pass band of the LHM can be shifted and a new pass band can be generated by introducing capacitors. When capacitors and inductors are introduced simultaneously, the resonance of traditional LHM is somewhat weakened and the number of original pass bands as well as its bandwidth can be changed.     

H4+的稳定性及形成和分解过程实验研究

利用Penning ion trap获得了七种不同延时时间(即反应时间)的离子谱Hn+(n≤4),用充分的实验数据证实了H4+是稳定的,稳定时间达1秒量级。实验结果显示：H4+是经合成反应H2++H2→H4+,H3++H+H2→H4++H2产生的;H4+的分解产物是H3++H。分析得出：H4+构型为H3+-核构型。     

Penning阱存储离子的高分辨分析

根据Penning阱中存储和探测离子的原理,研究改善离子谱分辨率的有效措施,发现离子谱的分辨率与LC振荡回路的Q值、阱中离子的密度及LC回路的谐振频率等因素有关.实验中,谐振频率为480千赫兹,Q在120左右,电子束流在40微安左右,真空度合适时,得到了较高分辨率的离子谱.最后对离子谱进行了辨认,离子分别是H+3,H+5,H+6,H+7.