中国联合球形托卡马克氦放电等离子体的碰撞辐射模型及其在谱线比法诊断的应用

介绍了针对中国联合球形托卡马克氦放电等离子体建立的碰撞辐射(CR)模型.给出CR模型计算的来自主量子数n=4激发态能级的三条谱线的强度比447.1 nm(23P—43S)/492.2 nm(21P—41D)和492.2 nm/504.8 nm(21P—41S)在电子温度Te和电子密度Ne空间内的计算结果.建立了根据谱线强度比确定Te与Ne的谱线比法.将该方法应用在氦放电等离子体诊断上,通过与微波干涉仪测量结果的对比以及CR模型与实验测量的激发态数密度的对比验证了方法的有效性.分析了引起诊断结果误差的因素,包括实验测量设备误差、CR模型使用的速率系数不确定度与能级选取,以及光谱测量的弦积分特性等.     

高离化类Ne铕离子的双电子伴线结构的理论研究

在对高离化态类Ne铕离子及其临近的类Na、类Mg离子的n=3→2跃迁的波长和强度详细计算的基础上，考虑了等离子体中单个谱线的展宽和谱线之间的重叠，得到了类Ne铕离子n=3→2的共振线及其类Na和类Mg离子双电子伴线的结构，并系统地分析了这些伴线对共振线波长和强度的影响.     

低压氢等离子体发光光谱

本实验使用2.45 GHz微波(100～200 W)激励产生低压(1～4 kPa)氢等离子体,通过光纤光谱仪探测氢等离子体的发射光谱,并分析了特征谱线分布及谱线强度随压强、功率的变化情况,计算了氢等离子体的电子激发温度.实验结果表明,压强由1 kPa增加至4 kPa,谱线强度减小;功率由100 W增大至200 W,谱线强度增大.随着压强的增大,电子激发温度减小或先减小后增大.     

低压氢等离子体发光光谱

本实验使用2.45 GHz微波(100～200 W)激励产生低压(1～4 kPa)氢等离子体,通过光纤光谱仪探测氢等离子体的发射光谱,并分析了特征谱线分布及谱线强度随压强、功率的变化情况,计算了氢等离子体的电子激发温度.实验结果表明,压强由1 kPa增加至4 kPa,谱线强度减小;功率由100 W增大至200 W,谱线强度增大.随着压强的增大,电子激发温度减小或先减小后增大.     

低压氢等离子体发光光谱

本实验使用2.45 GHz微波(100～200 W)激励产生低压(1～4 kPa)氢等离子体,通过光纤光谱仪探测氢等离子体的发射光谱,并分析了特征谱线分布及谱线强度随压强、功率的变化情况,计算了氢等离子体的电子激发温度.实验结果表明,压强由1 kPa增加至4 kPa,谱线强度减小;功率由100 W增大至200 W,谱线强度增大.随着压强的增大,电子激发温度减小或先减小后增大.     

α粒子激励Ne光谱测量

利用单光子计数装置测量了α粒子激励条件下Ne的光谱,实验研究了压力、组成对谱线强度的影响,在理论上对实验结果作了较详细的解释说明。提出了实现核泵浦~3He—Ne的5852(?)谱线激光的可能性。     

复合X光激光中复合阶段拉氏点的特性

 给出了拉氏点在进入Ne/Te增益目标区域后，其电子密度、电子温度、裸核布居概率、类H离子2–1线逃逸概率和增益随时间变化的近似估计式，以及拉氏点进入Ne/Te增益目标区域的时间tg与电子温度Teg必须满足的关系。     

测定硅原子共振谱线精细结构相对强度

原子光谱实验应主要了解谱线波长和谱线强度两个问题。前者涉及原子能级结构,后者涉及原子能级之间跃迁概率;二者紧密联系,是了解原子结构的二个方面。原理共振谱线是指从最低激发态直接跃迁到基态的谱线。硅原子基态是[Ne]3s~23p~2[~3P],三重态的最低激发态是[Ne]3s~23p4s[~3P],共振跃迁如右图所示。当精细分裂不大时,温度对ν~4影响很小,则A可视为常数。对于L→L跃迁,精细结构强度的理论计算为经计算,获得的硅原子共振线精细结构强度列表如下。     

日食对Ne发射光谱强度的影响

为了观测日食时刻日－地空间发生的异常物理现象，本工作采用了观测Ne放电管光源的Ne光谱变化的方法，观测结果表明，日食对Ne光谱的强度产生影响，越接近食甚时刻，Ne光谱强度越弱。     

充氖夫兰克-赫兹管的发射光谱研究

用光栅光谱仪测量了夫兰克-赫兹实验中Ne原子的发射光谱.光谱分析表明,橙黄色的发射光包含多条谱线,已标定的谱线都是Ne原子从第二激发态的各个子能级跃迁到第一激发态的对应能级所产生的.     

Recombination processes and quenching of negative afterglow by microwaves — Ne,Ne + He

Quenching of the afterglow of an interrupted negative glow by application of microwaves to the decaying plasma has been observed. The time dependences of Ne atomic spectral line intensities show that two distinct groups of spectral lines, each group having its own time dependence in the afterglow, are emitted. Both the potential curves and energy level positions known for Ne ₂ ⁺ and Ne₂ are discussed with respect to the observed effects. The time dependence of Ne spectral lines cannot be explained by the temperature dependence of recombination coefficients only.The enhanced Mo spectral line emission (material evaporated from the cathode) caused by microwaves during the discharge period or after current cutoff, makes it possible to estimate the electron temperature increase and relaxation during and after the microwave pulse.     

类氖-锗电子碰撞激发X光激光的增益特性

 电子碰撞激发X光激光的增益特性依赖于电子密度Ne、电子温度Te、增益区宽度D R和介质速度梯度dv/dz等四个表征等离子体内部状态的参数。以类氖-锗离子为例研究了反转和增益特性对Te、Ne的依赖关系，并在典型的增益区宽度（D R=100 μm）和介质速度梯度（dv/dz=1.3×10⁹s^-1）下讨论了共振线俘获对增益特性影响，给出波长为19.6nm, 23.2nm和23.6nm三条激光线的增益目标区域。还讨论了双电子复合过程对离子布居的重要影响。     

Production of copper vapor in a pulsed hollow cathode discharge

Spectral emission from a pulsed Cu hollow cathode was investigated in relation to discharge current to gain information on the density of the sputtered Cu vapor and on the persistence time of the metastable and ground-state atoms. The cathode was excited with 250 μsec discharge pulses at current densities up to 1 A/cm², using He, Ne and Ar as buffer gases. The intensities of the emitted Cu I lines were found to depend strongly on the simmer current. In atmospheres of Ne or Ar, the intensities of the resonance lines exhibited characteristic maxima during the initial 20 μsec of the discharge pulses. The density of the sputtered Cu atoms was determined by absorption measurements using a second Cu hollow cathode as alight source.     

Investigations on the thermionic diode: The ionisation probability of Rbn 2 P J atoms by noble gas collisions

By using the frequency-doubled light of a single-mode dye laser the effect of noble gas collisions (Ne and Xe) on the intensities of the Rb principal series lines 5S-nP (n≧15) has been studied in a thermionic diode. The signal intensities of the low-lying lines of the series could be increased considerably by applying higher noble-gas pressures. The intensities of the high-lying lines were found to be pressure independent indicating a constant ionisation probability of highly excited atoms by collisions. By comparing the diode signals of the discrete lines with the ionisation continuum it is shown that the ionisation probability of high-lying levels is unity within the experimental error.     

Intensitäten myonischer röntgenlinien in argon,in wasserstoff plus argon und in argon plus neon

Muonic X-ray spectra from Ar and H₂ + Ar have been measured with a high-pressure gas target. Strong differences between the observed intensities of corresponding lines were found for the two cases. The results are compared with cascade calculations. The ratio between Coulomb capture in Ar and in Ne for an Ar-Ne mixture (atomic ratio 1:1) was determined to be 1.11±0.14.     

The Li-like KLL-Auger spectrum of foil excitation Ne-projectiles

KLL-Auger transitions of the three electron system in Ne have been recorded in a coincidence experiment free of contaminants from other systems. Energies as well as intensities are compared with calculated values.     

High resolution Ne KLL Auger spectra produced by H+ and He+ bombardment

Ne KLL Auger satellite lines are measured with an energy resolution of 0.02% FWHM. The relative intensities of initial 2p vacancy satellite lines are observed to be four times larger with He⁺ than with H⁺ bombardment. The He⁺ beam also produces new satellite lines which are assigned to double initial 2p vacancies.     

时间相关穆斯堡尔谱与GaAs的119mTe离子注入

本文提出并实现了一种新的穆斯堡尔谱——时间相关穆斯堡尔谱。这是利用两步衰变^119mTe→¹¹⁹Sb→¹¹⁹Sn而获得的。测量了110keV ^119mTe加10¹⁵稳定Te/cm²注入并经600℃退火的样品在不同测量时间内的穆斯堡尔谱,分析了各谱线随ξ的变化。这里ξ是我们定义的参量,它等于Φ_Te/Φ_总,由退火时刻t_{a关键词：}     

激光能量对激光诱导Cu等离子体特征辐射强度、电子温度的影响

利用Nd:YAG激光(波长1 064 nm,脉宽10 ns)烧蚀金属Cu靶获得等离子体 .改变激光脉冲能量,观测到Cu的原子谱线和离子谱线随激光脉冲能量有不同的变化关系, 但都在330 mJ/pulse时,谱线强度达到最大,随后在330 mJ～370 mJ/pulse间出现一小平台 ,能量继续增加,各谱线强度减小.同时,使用烧蚀Cu靶产生的五条原子谱线(465.11 nm,5 10.55 nm,515.32 nm,521.82 nm,529.25 nm)的相对强度,在局部热力学平衡近似下,利用B oltzmann图的最小二乘法拟合,测定了不同激光能量下Cu等离子体的电子温度.随激光能量的增加,电子温度近似单调地从1.02×104 K上升到1.46×104 K后,反而有所下降.