GaAs光电阴极片原子级表面清洁方法的研究及评价

本文对GaAs光电阴极片UHV系统中原子级表面清洁方法做了研究,它们是:光加热法、直接加热法、离子轰击加退火法、热子加热法,表面清洁效果用装于UHV系统中间在线俄歇检测,表面质量用Aa/GaAuger峰高进行比较,指出两种用于第三代象增强器光电阴极的表面清洁方法:CS-离子轰击加退火法和热子背加热法。     

关于离子选择性电极分析中的等电位差－标准加入法的探讨

本文提出了一种新的离子选择性电极分析方法，即等电位差－标准加入法。本方法已用于氟的测定。进行了理论数据验证及误差分析，标准溶液的回收率为９６．６％－１０４．３％。本方法的影响因素少、准确度好、操作及计算简便。     

离子色谱法测定清洗液废酸中的4种阴离子

介绍了清洗液废酸中F-、Cl-、SO42-和NO3-的测定方法,通过一定的前处理,减少清洗液废酸中金属离子及残留酸液的干扰,有效去除了对色谱柱带来的污染。利用优化的实验条件,准确测定了清洗液废酸中F-、Cl-、SO42-和NO3-的含量,检出限分别为0.04、0.09、0.71、0.27mg/L,回收率为94%—109%。     

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介绍了为开展漏孔检测、氘-氦分辨性能及真空检漏技术等相关实验研究而进行的四极质谱计分析与测量系统的研制,描述了真空室结构、抽气设备的选型、测量仪器的选择及控制保护子系统工作方式。对系统进行了包括极限真空、残余气体质谱分析、漏放气率、质谱计性能等测试,结果表明本系统达到了设计要求。     

Effect of nitrogen addition on hydrogen incorporation in diamond nanorod thin films

The effect of nitrogen addition in the feed gas on the finally incorporated amount of hydrogen in the diamond nanorods (DNRs) thin films has been investigated. The Raman spectroscopy measurements helped to understand the structural and quality changes with increasing nitrogen gas flow rate during CVD deposition. The hydrogen concentration was measured with 3.0 MeV He²⁺ beam using elastic recoil detection analysis technique and it was found that with the addition of nitrogen, the hydrogen concentration was increased. The results of non-Rutherford backscattering spectroscopy (NRBS) used to measure the amount of nitrogen in the DNRs thin films have shown that the incorporated nitrogen is below the detection limit of NRBS technique. Our results suggested that the addition of nitrogen has affected the overall quality of diamond films in two ways; increasing the thickness of diamond films by increasing the non-diamond carbon content and increasing the hydrogen impurity incorporation. The role of nitrogen additive on diamond growth and hydrogen incorporation is discussed.     

氦原子及类氦离子基态能量的经验公式

通过对氦原子和类氦离子电离能数据的分析 ,找到了一个能够快速计算类氦体系基态能量的经验公式 ,验算了一些类氦离子 (Z=2— 1 5 )的基态能量 ,与实验测量值符合得很好。除了 Li 和 Be 的基态能量的相对偏差为 0 .4 46 %外 ,其他的都低于 0 .4 %。     

RIBLL束流诊断

描述了兰州放射性离子次级束流线(RIBLL)上研制并安装使用的放射性束流(RIB)诊断装置的种类、结构、性能及在AIBLL上的位置和功能.重点叙述了以光纤为基础的几种诊断元件,它们探测效率高、响应时间快、制作容易、性能稳定.给出了RIB¹⁷N等高图,说明诊断装置辅助MBLL得到RIB的水平.     

Numerical study on electrostatic potential distribution of large cylindrical oil tanks

This study carried out a numerical simulation of electrostatic potential distribution in the cylindrical oil tank, focusing on spatial distribution of electrostatic potential and the variation tendency of the potential in the filling operation. Electrostatic potential distribution of stationary oil was illustrated, and the relationship between the electrostatic potential distribution and some parameters of the tank and oil was analyzed as well. Dynamic electrostatic distribution was studied when charged oil is filling into the tank, and ESD prevention measures’ effects on electrostatic potential distribution were simulated. Finally, calculation results of two other types of oil tanks were presented in brief.     

用离子阱经H2++H2碰撞反应碰撞反应制备H4+

用Ｐｅｎｎｉｎｇ型离子阱经碰撞反应Ｈ２＾＋＋Ｈ２→Ｈ４＾＋产生稳定的Ｈ４＾＋,主要的反应产物是Ｈ３＾＋,但十分明显地观测到Ｈ４＾＋信号。Ｈ４＾＋在阱中稳定存在时间长达０．１ｓ量级,远比Ｋｉｒｃｈｎｅｒ等人测量的１０＾－６ｓ量级长,最后讨论了生成Ｈ４＾＋的反应过程机制。