双光束干涉光谱术中的TSVD方法

本文考察了双光束干涉光谱仪中应用TSVD方法的结果,发现由于积分核cos(2πσx)的正交对称性质使得截断奇异值无法进行,而将积分核变形后再做截断,其实质是截去了积分核逆矩阵中的一部分,从而说明了双光束干涉光谱术中采用TSVD方法能够使复原光谱高波数侧具有较高信噪比的根本原因。     

岩石中稀土元素的分离富集及荧光X－射线光谱法测定

文中用合成的偶氮氯磷－ｍＡ螯合形成纤维（以下称ＣＰＡ－ｍＡ纤维）对地质样品中的稀土元素进行分离富集，并制成薄试样进行荧光Ｘ－射线光谱法测定［１，２］。ＣＰＡ－ｍＡ纤维合成简单，交换速度快，在抗坏血酸和混合掩蔽剂（ＥＤＴＡ＋ＣＹＤＴ＋ＥＧＴＡ）存在下使痕量稀土元素及基体分离并得以富集。分析结果表明该方法的ＲＳＤ小于１５．６８％，标准加入回收率在８４．０～１０７．５％之间，能较好地满足地质工作的需要。     

激光诱导荧光法研究CH2Cl2分子的振动能量转移

本文中用激光诱导荧光法首次研究了有机分子CH₂Cl₂分子的振动能量转移。实验测得了CH₂Cl₂分子的ν₃和ν₃/ν₉振动模的激活和消激活速率常数,以及稀有气体分子对CH₂Cl₂分子的ν₃/ν₉振动模消激活的影响。用SSH理论计算了CH₂Cl₂-稀有气体碰撞,CH₂Cl₂分子ν₃/ν₉的V-T能量转移相对几率,分析讨论了CH₂Cl₂分子的振动能量转移的通道。 关键词：     

激光诱导荧光法研究CH_2Cl_2分子的振动能量转移

本文中用激光诱导荧光法首次研究了有机分子CH_2Cl_2分子的振动能量转移。实验测得了CH_2Cl_2分子的υ_3和υ_3/υ_9振动模的激活和消激活速率常数,以及稀有气体分子对CH_2Cl_2分子的υ_3/υ_9振动模消激活的影响。用SSH理论计算了CH_2Cl_2-稀有气体碰撞,CH_2Cl_2分子υ_3/υ_9的V-T能量转移相对几率,分析讨论了CH_2Cl_2分子的振动能量转移的通道。     

介质球极化强度矢量的辨析

问题的提出:将一介电常数为ez,半经为a的介质球置于均匀外场E0中,若球外充满另一介电常数为e1的介质,求球内、外的电场,进而讨论介质球的极化强度矢量.很显然,球内、外的电场是原来的均匀电场与球面上极化电荷的场的叠加,用分离变数法容易求得叠加后球内电场仍为均匀场　　　　　　　,而球面上极化电荷在球外的场则等效于一个位于球心、电矩 的电偶极子所激发的.由于球内的场是均匀的,介质球的极化也是均匀的,因此在有的教科书[1]和参考书[2]中,得出介质球的极化强度矢量 必须指出,用(1)式来表示介质球的极化强度矢量是错误的.因为电矩 是…     

Dependence of Isoscaling Parameters on Nucleon-Nucleon Cross Section and Momentum-Dependent Interaction

Inltuences of the isospin dependence of the in-medium nucleon-nucleon cross section and the momentum-dependent interaction （MDI） on the isotope scaling are investigated by using the isospin-dependent quantum molecular dynamics model （IQMD）. The results show that both the isospin dependence of the in-medium nucleon-nucleon cross section and the momentum-dependent interaction affect the isoscaling parameters appreciably and indepen- dently. The inltuence caused by the isospin dependence of two-body collision is relatively larger than that from the MDI in the mean tield. Aiming at exploring the implication of isoscaling behaviour, which the statistical equilibrium in the reaction is reached, the statistical properties in the mass distribution and the kinetic energy distribution of the fragments simulated by IQMD are presented.     

Humidity Effects on Imaging and Nanomanipulation of Individual DNA Molecules on HOPG Surface

Single DNA molecules are aligned on highly ordered pyrolytic graphite （HOPG） surface in ambient air. It is shown that environmental humidity has a remarkable influence on the measured height of DNA by atomic force microscopy （AFM）, probably due to the conformation transition of DNA. We also demonstrate that DNA molecules deposited on HOPG surface can be ＇pushed＇ much more easily by AFM tip at high humidity than at 10W one.     

Deuterium Clusters Fusion Induced by the Intense Femtosecond Laser Pulse

Neutrons （2.45MeV） from deuterium cluster fusion induced by the intense femtosecond （3Ors） laser pulse are experimentally demonstrated. The average neutron yield 103 per shot is obtained. It is found that the yield slightly increases with the increasing laser spot size. No neutron can be observed when the laser intensity I 〈 4.3 × 10^15 W/cm^2.