【摘 要】
：
By numerically solving the three-dimensional time-dependent Schr(o)dinger equation,we have inves-tigated multiphoton ionization of hydrogen atom in the two-color circularly polarized (TCCP) laser fields consisting of a strong 400 nm and a much weaker 800
【机 构】
：
School of Physics and Wuhan National Laboratory for Optoelectronics,Huazhong University of Science a
论文部分内容阅读
By numerically solving the three-dimensional time-dependent Schr(o)dinger equation,we have inves-tigated multiphoton ionization of hydrogen atom in the two-color circularly polarized (TCCP) laser fields consisting of a strong 400 nm and a much weaker 800 nm pulses.Due to the presence of pertur-bative 800 nm laser pulse,sideband peaks emerge between the above-threshold ionization rings in the photoelectron momentum distributions.Our numerical results show that the sideband peaks exhibit one-lobe structure in the co-rotating TCCP laser fields,while it displays the three-lobe structure in the counter-rotating TCCP laser fields.Moreover,the photoelectron yield of sidebands in the co-rotating TCCP fields is much higher than those of the counter-rotating TCCP fields.These phenomena could be well explained from the perspective of the photon-absorption channels via the selection rules.In-terestingly,an obvious phase shift between the sidebands of different orders from the co-rotating and counter-rotating TCCP fields is observed.This shift indicates the helicity-dependent time delay in the one-photon continuum-continuum transition process.
其他文献
目的通过Ho掺杂提高Ba(Zr0.1Ti0.9)O3(BZT)基Y5V型陶瓷的介电性能。方法采用Sol-gel一步法研究Ho掺杂对BZT基Y5V型纳米粉体及陶瓷微观形貌及介电性能的影响规律。结果当Ho含量为0.10 mol%时,陶瓷最大介电常数为19943,容温变化率(TCC)符合Y5V标准。结论随Ho含量的增加,BZT陶瓷的居里温度向低温方向移动,居里峰展宽,最大介电常数先增大后减小。因此,通过匹配的元素对材料进行掺杂改性,同时辅以优化的
摘要：利用ABAQUS有限元模擬软件建立V级围岩条件下山岭隧道洞口段的地震响应数值模拟三维模型，对比研究其在不同衬砌刚度时的抗震响应情况，从而得到衬砌刚度对其抗震性能影响的规律。衬砌刚度取用20GPa、30GPa、40GPa、50GPa四种不同工况，在模型底部施加水平方向的地震荷载。通过研究发现：当衬砌刚度为30GPa时能起到较好的抗震效果，且结构强度有较大富余量；刚度为20GPa时结构偏“柔”致
S ince the realization of Bose-Einstein condensation(BEC) [1-3] and degenerate Fermi gases [4],ultra-cold quantum gases have become important plat-forms to study quantum phenomena and novel states of matter with precise control over both internal and exte
光催化是将太阳能转换为化学能的绿色可持续发展途径,有望解决日益严重的能源危机和环境污染问题.在光催化过程中,半导体材料作为光催化剂,负责可见光的捕获、光生载流子的生成和传输以及氧化还原反应,在整个光催化系统中起着决定性的作用.共价有机骨架材料(COFs)是一类新兴的半导体光催化剂,已被证明在可见光诱导的水分解、二氧化碳还原、有机转化反应和水中污染物降解方面具有应用前景.然而,大部分COFs是通过可逆反应构筑的,在水中及苛刻条件下的稳定性差.因此,提升基于COFs的光催化剂在水相中的光催化活性和循环稳定性仍
随着我国国民经济的快速发展,碳基能源需求量在不断上升,能源供需矛盾日益凸显.在可再生能源替代传统化石能源之前,着手开发合成气催化转化补充石油路线获得油料和大宗化学品成为形势所需,其中的关键点之一是高效催化剂的开发以实现对产物选择性的精准调控.近年来,利用氧化物/分子筛双功能催化剂将甲醇合成和C–C偶联有效集成的催化体系开辟了合成气转化乃至C1转化的新路径.随着合成气直接制低碳烯烃和芳烃等一系列研究取得重大进展,合成气定向转化为高品质汽油作为C1化学领域另一极具挑战性的研究课题也受到了科研工作者们的广泛关注
We investigate the cyclotron dynamics of Bose-Einstein condensate (BEC) in a quadruple-well po-tential with synthetic gauge fields.We use laser-assisted tunneling to generate large tunable effective magnetic fields for BEC.The mean position of BEC follows
Remote state preparation (RSP) provides a useful way of transferring quantum information between two distant nodes based on the previously shared entanglement.In this paper,we study RSP of an arbitrary single-photon state in two degrees of freedom (DoFs).
二甲苯作为石油化工行业中的基础原料,其应用价值很大且需求量逐年增加,因此二甲苯分离提纯的研究具有重要理论意义和工业应用价值.同时,二甲苯异构体分离被认为是改变世界的七大分离难题之一.金属有机骨架材料MIL-125是一种典型的含钛金属有机骨架材料,被广泛应用于光催化氧化和吸附分离中.目前传统金属有机骨架材料MIL-125的合成方法需要严格的无水操作环境以及无水级的超纯试剂.由于合成过程中钛源极易水解,很难控制其水解速率.本研究组提出了一种新的MIL-125的合成方法,该法引入了耐水解的含钛无机-有机杂化低聚
High-fidelity quantum gates are essential for large-scale quantum computation.However,any quantum manipulation will inevitably affected by noises,systematic errors and decoherence effects,which lead to infidelity of a target quantum task.Therefore,impleme
在质子交换膜燃料电池中,金属铂是最高效的阴极氧还原催化剂之一,但是铂昂贵的价格严重阻碍了其在燃料电池领域中的大规模商业化应用.通过铂与3d过渡金属(Fe、Co和Ni)合金化可以有效提高催化剂的氧还原活性,然而在实际的高腐蚀性、高电压和高温的燃料电池运行环境中,铂合金纳米粒子易发生溶解、迁移和团聚,从而导致催化剂耐久性差.同时过渡金属离子的溶出会影响质子交换膜的质子传导,并且一些过渡金属离子会催化芬顿反应,产生高腐蚀性•OH自由基,加快Nafion和催化剂的劣化.与过渡金属掺杂相比,非金属掺杂具有明显优势: