CO（A 1Π～e 3Σ-）混合激发态碰撞传能过程的量子干涉效应———跃迁振幅和相位角的时间特性

从含时微扰的一级波恩近似出发 ,进一步研究了CO(A～e)混合态在以He或HCl为碰撞伴时其跃迁振幅和相位角的时间特性 .计算显示跃迁振幅随时间显现衰减的振荡 .其振荡周期反比于初末态的能量差而衰减时间则决定于碰撞体系的分子间相互作用势能 .对于给定的碰撞参数和碰撞速度 ,CO分子从初始转动态J到末态J′的跃迁可经过许多不同的通道 ,包括CO的不同量子数M和碰撞伴的各种J和M .所以实验的跃迁振幅及其实部和虚部是所有不同通道的平均结果 .当He为碰撞伴时 ,所有的单重态和三重态通道的跃迁振幅矢量都处于复平面的第一象限 ,而当HCl为碰撞伴时 ,则单重态和三重态通道的跃迁振幅矢量分别处在第四和第一象限 ,这就解释了以He为碰撞伴时干涉相位角小于 90°而以HCl为碰撞伴时则大于 90°的实验事实 .     

Flow Injection Analysis for Beryllium Determination With Chrome Azurol S as Chromogenic Agent

Abstract

A flow injection analysis system which employs a visible absorption detector is used for the determination of beryllium. Be(II) ions are detected by means of a complexation reaction between Be(II) and chrome azurol s as the chomogenic reagent. The reaction forms a stable 1:1 complex which appears dark red-violet. The optimum conditions for the determination are pH 4.15, 35% chrome azurol s, 3% buffer, 62% HCI and 1,3-phenylenediamine, flow rate of 1.0 mL/min, and wavelength at 570 nm. A concentration limit of 0.1 μg/mL (or 2 ng in 25 μ of a sample injected) of Be(II) can be detected, and the linear dynamic range extends to 100 μg/mL. Some interference limits are established in the presence of EDTA and thiosulfate which are used as masking agents.     

Determination of fluorine by total reflection X-ray fluorescence spectrometry

There is a growing interest in determination of low Z elements, i.e. carbon to phosphorus, in various samples. Total reflection X-ray fluorescence spectrometry (TXRF) has been already established as a suitable trace element analytical method with low sample demand and quite good quantification limits. Recently, the determinable element range was extended towards Z = 6 (carbon).     

时分复用激光干涉测速技术研究

为了探索和发展瞬态激光干涉测量技术,本文从理论上对激光差频干涉测速度技术进行了分析,并对该技术的应用基础和发展前景进行了剖析.基于对该技术中关键技术的分析、讨论,提出了时分复用激光干涉测速技术的概念.充分利用了激光差频干涉测速技术中的延迟时间τ,在时间段0~τ和τ之后,激光干涉分别体现的是测位移技术和测速度技术,从而可较好地确定冲击与爆轰等物理过程中的第一冲击前沿的速度值(解决条纹丢失的不确定性);同时在硬件要求不太高(降低对记录用示波器等的带宽和采样率的要求)的情况下,保证有较高的速度测量上限.结合爆轰与冲击物理过程特性的考虑,通过选择合适的干涉测试技术参量,设计并建立了光纤时分复用激光干涉测速系统,进行了时分复用激光干涉测速技术的初步应用研究,获得了较好的应用结果,从而验证了该技术的有效性.     

光学干涉光谱的模拟与分析

应用Matlab编程仿真牛顿环及迈克尔逊干涉实验形成的图形,得到它们的光谱特性和相对光强分布,研究结果为光学仪器的检测及光波的测定提供理论依据.     

消除原子吸收光谱分析中干扰效应的正交多项式回归设计

应用正交多项式回归设计的方法,对原子吸收光谱分析中的干扰效应进行计算消除的研究。通过实验建立了针对高纯 Eu2O3中钙含量测定时消除干扰的最优回归方程,回归方程精度为 1.32× 10－ 2,对高纯 Eu2O3中钙含量测定,计算结果与实际含量基本一致,相对误差为 1％～ 4％。     

转动传能中的量子干涉: 干涉角和相对速度的关系

考虑一级含时波恩近似和长程相互作用势, Sun提出了转动传能中的量子干涉模型.在静态池中CO A1Π～ e 3Σ-和He碰撞的实验已经成功模拟.为了从实验中直接获得碰撞速度和干涉角的关系, Sha提出了利用分子束和离子速度成像技术的实验.作为理论研究干涉角和碰撞速度的关系,计算了不同速度下的干涉角,同时获得了变化的趋势.对在分子束条件下(通过控制碰撞速度来控制干涉角)实验具有指导意义.     

Energy Transfer Within CO（A 1Π～e 3Σ-）Mixed States———Temporal Behavior of Transition Amplitude and Phase Angle

A further study on the temporal behavior of collision-induced transition amplitude and phase angle within CO（A～e）mixed states is carried out based on the first order Born approximation of time dependent perturbation theory for He or HCl as the collision partners. The calculation shows that the transition amplitudes appear some damped oscillation with the period reciprocally proportional to the energy gap between the initial and final states while the damping time is determined by the inter-molecular potential of the collision system. For a given impact parameter and collisional velocity,the transition of CO from an initial rotational state J to the final state J' may proceed through many channels with different quantum numbers M of CO and different J and M quantum numbers of the collision partner. So the experimental transition amplitudes with its real and imaginary parts are the average of all the possible channels. It is interesting to note that in the case of He as the collision partner,all the transition amplitude vectors for both singlet and triplet channels are located in the 1st quadrant of the complex plane,whereas for HCl as the collision partner the transition vectors of singlet and triplet channels are located respectively in the 4th and 1st quadrants. These results well explain the experimental fact that the interference phase angle is smaller than 90o for He as the collision partner,whereas it is larger than 90o for HCl as the collision partner.     

离子色谱法测定氟化物的干扰及其消除

针对离子色谱法与离子选择电极法测定地面水样品中氟化物存在一定偏差的现象,此文较详细地研究了影响测定结果的干扰因素,确证ＣＯ３＾２－,ＨＣＯ３＾－均能产生正干扰,其干扰程度与干扰物质的含量成正比,为消除基体的干扰,可采用标准加入法。     

钢中铜对磷的光谱干扰系数的测定

用ＩＣＰ－ＡＥＳ法在波长２１３．６１８ｎｍ处测定钢铁材料中磷时,铜２１３．５９８ｎｍ 对其产生很强的光谱干扰。本文定量地测定了该干扰系数。