分子转动和激光脉冲对多光子激发控制的影响(英文)

用解析代数方法研究了分子转动和激光脉冲对双原子分子多光子激发控制的影响并推导得到不同转动通道下的分子振动激发几率的解析表达式.为了考察转动能级和考虑分子转动后与激光场夹角的变化对分子多光子振动激发和振动激发控制的影响,我们计算并比较了分子纯振动和加入分子转动两种情况,并分别给出了分子与极化激光场在不同取向角下三光子选择激发的图像.研究发现分子的转动能级对多光子非共振激发有修正作用,但是分子转动会降低多光子激发的选择性,而选择合适的激光脉冲形状有利于目标多光子激发控制的实现.文中还进一步讨论了激光脉冲初相位对分子多光子激发控制的影响,发现脉冲初相位对多光子激发过程有明显的调制作用.     

用小角X射线散射法和31P核磁共振技术研究蓖麻酸对磷脂胆固醇混合脂质体液晶态结构的影响

采用小角X射线散射法和³¹P核磁共振技术研究了蓖麻酸对磷脂酰乙醇胺和胆固醇混合脂质体液晶态结构的影响,实验结果表明:蓖麻酸对磷脂胆固醇混合脂质体结构有稳定作用。在含有高效分散剂的磷酸盐缓冲溶液中制成的液晶态蓖麻酸多相脂质体由立方六角相构成。 关键词：     

多服务台可修系统的优化分析

机器可修系统是可修排队的一个重要研究方向,研究了具有止步,中途退出和服务台可发生故障的M/M/R机器可修问题.利用矩阵几何解法,得到了稳态概率的矩阵几何解,在此基础上建立了系统的费用模型,并进行了数值分析.     

Electric flux distribution in photodetachment of heteronuclear diatomic molecular negative ion

The photodetachment of a hetero-nuclear diatomic molecular negative ion is studied by using a two-centre model. An analytic formula is presented for the electron flux distribution of a heteronuclear diatomic molecular negative ion. Taking HF^- as an example, we calculated the electron flux distributions of this ion for various detached electron energies. The results show that the electron flux distributions exhibit oscillatory structures, which are caused by the interference effect between the two nuclei. Besides, the laser light polarization also has a great influence on the electron flux distribution. The oscillation amplitude is the largest when the laser polarization is parallel to the z-axis; when the laser polarization is perpendicular to the z-axis, the oscillation almost vanishes. This study provides a new understanding of the photodetachment of a heteronuclear diatomic molecular negative ion.     

Coherent Control of Photodetachment of H- in Perpendicular Electric and Magnetic Fields

Using the semiclassical closed orbit theory, we study the coherent control of the photodetachment of H^- by a single and double-pulse laser in perpendicular electric and magnetic fields. Theoretically, dependences of calculated cross section on laser pulse widths, time delays, relative phases and the classical detached electron＇s closed orbit period are presented and discussed in detail. The results suggest that for the single pulse laser, if the pulse width is shorter than the particular closed orbit period, then the contribution of that dosed orbit to the photodetachment cross section is reduced. While for the double pulse laser, the cross section not only depends on the pulse width, but also depends on the time delay and the relative phase of the two pulses, If the pulse delay time equals to the period of one closed orbit, then the contribution of that orbit becomes significant. Therefore, we can use the pulse laser to control the photodetachment process of ion or atom in external fields.     

强场中NO分子回归谱的长程散射矩阵的理论研究

采用半经典散射矩阵方法研究外磁场中高里德伯态双原子分子在能量范围为77010—77050cm^-1的回归谱.通过引进模型势简化强磁场中NO分子的高里德伯电子的势函数,找出其在核转动量子数分别为N=1,3,5的三个通道中的闭合轨道,重点分析了强磁场中NO分子的长程散射矩阵元实部的傅里叶变换谱与闭合轨道之间的一一对应关系.     

关于雷诺实验再研究的报告

在我们做了一系关于雷诺实验再研究的实验研究之后，我们认为有必要向流体力学界作出一个报告：介绍流动的周向不稳定性及湍流首先发生在圆管的中央这样一些事实，这些现象至今尚未见到公开报道。     

聚丁二烯的核磁共振二维谱研究

<正> 聚丁二烯分子中有三种微观结构,顺式-1,4,反式-1,4和-1,2。这三种结构单元的含量和序列长度对聚丁二烯的物性有很大影响。异构单元的含量可用IR和氢谱测定。序列分布可用氢谱和碳谱测定。已经有许多工作致力于聚丁二烯碳谱的谱图解析。因为各作者使用不同的经验式或半经验式,统计方法也不一样,结论不尽相同。最近Sato等     

用凝胶渗透色谱测定聚合物中的支化度

本文在Ambler报导的测定聚合物中支化度的工作基础上,提出了支化度的计算方法和电子计算机计算程序,可用ALGOL-60语言在国产DJS-6电子计算机上计算。讨论了支化模型、短链支化和长链支化分布函数等对计算结果的影响,确定了该方法可以相对比较镍系顺式聚丁二烯中的支化度。