紫外和真空紫外光谱辐射标准灯一氘灯

本介绍了作为紫外和真空紫外标准灯一氘灯的一些特点，并阐述了用同步辐射源标定氘灯光谱辐射亮度的装置和方法。     

一种新型的紫外光源—准分子紫外灯

非相干性紫外或真空紫外光源的应用已成为众多工业部门中一项基础性和关键性的技术,本着重介绍一种使用介质阻挡放民激发紫外或真空紫外辐射的新型光源－－准分子此外灯,包括准分子的形成以及光源的紫外辐射效率,最后,对影响准分子辐射的因素如气压,气体组成,温度及电源频率和电压进行了初步的分析。     

一种新型的紫外光源--准分子紫外灯

非相干性紫外或真空紫外光源的应用已成为众多工业部门中一项基础性和关键性的技术.本文着重介绍一种使用介质阻挡放电激发紫外或真空紫外辐射的新型光源--准分子紫外灯,包括准分子的形成以及光源的紫外辐射效率.最后,对影响准分子辐射的因素如气压、气体组成、温度及电源频率和电压进行了初步的分析.     

平板等离子体紫外灯研究

在本文中,运用ITO玻璃和多孔氧化铝设计了一种平板等离子体紫外灯,最大辐射功率为230 mW.通过实验方法,研究并讨论了放电气体压强和放电气体组成对平板等离子体紫外灯紫外光辐射效率的影响.通过优化,平板等离子体灯的紫外灯紫外光辐强密度显著提高.实验结果显示:在3.3×104 Pa、气体间隙0.71 mm、前板玻璃厚为2.8 mm的平板等离子体紫外灯中,运用1 vol％氮气和99 vol％氩气混合气体作为放电气体时,紫外灯辐射功率密度最高可达到18 mW/m2.     

真空紫外微通道板光电倍增管的研制

主要讨论了真空紫外微通道板光电倍增管的工作原理及设计考虑，介绍了这种新型弱光探测器研制过程中的主要关键技术以及该器件所具有良好性能和广阔的应用前景。     

紫外和真空紫外光谱辐射标准灯-氘灯

本文介绍了作为紫外和真空紫外标准灯—氘灯的一些特点 ,并简述了用同步辐射源标定氘灯光谱辐射亮度的装置和方法     

固体中的离子迁移研究

本文综述了我们用 EPMA 和 SEM 技术研究固体中的离子迁移所取得的结果。主要内容包括:(1)测定在电子束轰击下固体中可迁移离子的种类和组成的变化。(2)确定低电导固体和快离子固体中的离子迁移的动力学方程式。(3)显示了金属沉积特征与离子迁移路径及固体显微结构的关系。所研究的固体材料为含 Na、Ag 和 Cu 离子的单晶、多晶和玻璃。特别对这些材料在电子束轰击下的离子迁移对轰击区组成变化及金属沉积的影响进行了研究。     

热循环、真空紫外辐照对Al/Kapton薄膜的损伤效应

在空间环境地面模拟设备中模拟热循环、真空紫外辐照等低地球轨道空间环境对Al/Kapton薄膜的损伤效应.利用原子力显微镜、紫外可见分光光度计对试验前后试样的表面形貌、光学参数等性能进行了分析.结果表明,热循环、真空紫外辐照使Al/Kapton薄膜试样产生质量损失,表面形貌发生不同程度的改变,在紫外可见波段的反射率下降明显.     

UV-754型紫外可见分光光度计氢灯故障分析及排除

UV-754型紫外可见分光光度计有两种常见故障：氢灯难于起辉和氢灯能够起辉,但起辉瞬间运算放大器即被烧毁。本文就此两种故障对电源线路进行了分析,并提出故障排除方法。     

离子火箭发动机真空试验设备的设计

根据离子火箭发动机试验的特殊要求,通过对真空室的尺寸和形状、离子火箭发动机的工作压力、真空室材料和主抽气真空泵选择的分析,得到满足离子火箭发动机试验要求的真空试验设备的设计。     

离子迁移谱检测仪信号处理方法研究

离子迁移谱（IMs）检测仪是对化学毒剂、有毒有害气体等化学物质进行痕量检测和分析的一种有效的快速现场检测仪器．介绍了离子迁移谱检测仪的组成结构和工作原理,先后讨论了几种信号处理方法,并对含噪IMS信号进行了处理．结果表明,数据平均、平滑、数字滤波有效消除了IMS信号中的噪声,本底扣除消除了信号基线的非线性特征,求导数法能准确地确定谱峰的峰位,确定了以约化离子迁移率为特征值的识别方法．这为实现IMS信号的准确识别奠定了基础．     

真空舱几何结构对离子推力器背溅射沉积影响的计算研究

有效降低溅射沉积影响是离子推力器地面寿命试验需要解决的关键技术问题。本文建立了真空舱壁上溅射物沉积到离子推力器表面的计算模型。结合LIPS-200推力器束流特性和石墨材料内衬,应用该模型分别计算和分析了平面靶圆柱型、平面靶圆锥台型、球面靶圆柱型、凸锥靶圆柱型、凹锥靶圆柱型五种真空舱几何形状与尺寸对离子推力器背溅射沉积的影响关系规律,得到了对具体设计LIPS-200推力器寿命试验真空舱具有指导作用的重要结论。     

Ion deposition in a crossed E×B field system with vacuum arc plasma sources

The system with crossed magnetic and electric fields and vacuum arc plasma sources for ion deposition and low-voltage plasma treatment and plasma immersion ion implantation has been investigated. The use of crossed E×B fields provides intense gas ionization and suppresses sheath expansion. Maximum deposition rate of about 1 μm min⁻¹ was obtained on the target surface located under the area where intense ionization of reactive gas occurs (circular area of about 40 mm wide around the target). Without magnetic field the maximum rate of only 0.15 μm min⁻¹ can be achieved. In the crossed E×B fields, high-quality dense TiN coating was obtained. High ion current density to the target surface reaches 500 A m⁻², provides effective cleaning of the target surface and heating of the growing film. The ratio of metal plasma current and reactive gas ion current reaches 2.1 and can be easily changed by adjusting the magnetic field strength, without changing the vacuum arc gun current. The uniform film deposition around circumference of the target is provided as a result of ion magnetization in the crossed field zone. The uniform film deposition along the entire target length can be provided by moving magnetic field up and down.     

用当代飞行时间二次离子质谱分析航天器污染

随着对航天器长寿命和高可靠性的要求日益提高，其污染问题已引起国内外高度重视。在监测污染物总量的基础上，需要有效的分析手段确定污染物的化学成分才能判断污染源。用当代飞行时间二次离子质谱仪器（TOF-SIMS）对我国地面空间环境模拟污染的典型样品进行了探索性实验，结果表明：与国内外现有的检测手段相比，当代TOF-SIMS最适于样品量有限的航天污染物的成份分析；具有高质量分辨的TOF—SIMS，对航天污染物包含的所有元素、同位素和化合物具有指纹鉴别能力；成像分析可解析出污染物形成历史的一些相关信息。TOF-SIMS有望在航天污染系统工程中发展成为一种独具特色的航天污染检测新技术。     

ICP-MS离子提取模型的建立与传输透镜的参数优化

电感耦合等离子体质谱(ICP-MS)具有对一种或多种基本元素、同位素快速分析的能力,在诸多领域有其广泛应用。本文对ICP-MS接口部分中等离子体气流及离子的运动过程进行了理论分析,基于Child鞘层定律首次建立了正离子提取模型,以确定离子束形成的初始位置。然后在忽略空间电荷效应的前提下,利用电、离子光学模拟软件SIMION计算离子在透镜传输系统中的运动轨迹,通过调整透镜电极电压参数来获取最佳的离子传输效率,并以此作为分析实验前透镜调谐工作的理论依据。     

Miniaturization of mass spectrometer-based leak detection technology-Technical note

Innovative pumping technology combining both, small-sized scroll- and turbomolecular pumps results in a substantial miniaturization of mass spectrometer-based leak-detector-systems, namely reduction of the outer dimensions to less than 30×30×15 cm and weight to less than 8 kg. To date this technique utilizes the Paul trap principle for leak detection with a sensitivity down to below 10⁻¹⁰ mbar l s⁻¹.     

离子在矩形波四极场中的运动与四极场离子阱质谱的数字化操作

矩形波驱动的四极场同样可用于对离子进行质量分析和存储。本文推导了离子在矩形波四极场中的运动规律,并以常用于正弦波四极场的马绍方程参量a,q来表出离子的稳定性。运用赝势阱概念探讨了离子在这种四极场中的本征振动,推导了本征振动频率的近似公式。在理论研究的基础上,提出了数字化离子阱质谱的概念,并运用离子光学模拟,研究了实际离子阱几何结构下的共振出射以及数字化质量扫描的可行性。     

Hard modeling Multivariate Curve Resolution using LASSO: Application to Ion Mobility Spectra

Multivariate Curve Resolution (MCR) aims to blindly recover the concentration profile and the source spectra without any prior supervised calibration step. It is well known that imposing additional constraints like positiveness, closure and others may improve the quality of the solution. When a physico-chemical model of the process is known, this can be also introduced constraining even more the solution. In this paper, we apply MCR to Ion Mobility Spectra. Since instrumental models suggest that peaks are of Gaussian shape with a width depending on the instrument resolution, we introduce that each source is characterized by a linear superposition of Gaussian peaks of fixed spread. We also prove that this model is able to fit wider peaks departing from pure Gaussian shape. Instead of introducing a non-linear Gaussian peak fitting, we use a very dense model and rely on a least square solver with L1-norm regularization to obtain a sparse solution. This is accomplished via Least Absolute Shrinkage and Selection Operator (LASSO). Results provide nicely resolved concentration profiles and spectra improving the results of the basic MCR solution.     

Measurement of 100 nm and 60 nm Particle Standards by Differential Mobility Analysis

The peak particle size and expanded uncertainties (95 % confidence interval) for two new particle calibration standards are measured as 101.8 nm ± 1.1 nm and 60.39 nm ± 0.63 nm. The particle samples are polystyrene spheres suspended in filtered, deionized water at a mass fraction of about 0.5 %. The size distribution measurements of aerosolized particles are made using a differential mobility analyzer (DMA) system calibrated using SRM^® 1963 (100.7 nm polystyrene spheres). An electrospray aerosol generator was used for generating the 60 nm aerosol to almost eliminate the generation of multiply charged dimers and trimers and to minimize the effect of non-volatile contaminants increasing the particle size. The testing for the homogeneity of the samples and for the presence of multimers using dynamic light scattering is described. The use of the transfer function integral in the calibration of the DMA is shown to reduce the uncertainty in the measurement of the peak particle size compared to the approach based on the peak in the concentration vs. voltage distribution. A modified aerosol/sheath inlet, recirculating sheath flow, a high ratio of sheath flow to the aerosol flow, and accurate pressure, temperature, and voltage measurements have increased the resolution and accuracy of the measurements. A significant consideration in the uncertainty analysis was the correlation between the slip correction of the calibration particle and the measured particle. Including the correlation reduced the expanded uncertainty from approximately 1.8 % of the particle size to about 1.0 %. The effect of non-volatile contaminants in the polystyrene suspensions on the peak particle size and the uncertainty in the size is determined. The full size distributions for both the 60 nm and 100 nm spheres are tabulated and selected mean sizes including the number mean diameter and the dynamic light scattering mean diameter are computed. The use of these particles for calibrating DMAs and for making deposition standards to be used with surface scanning inspection systems is discussed.