搜索结果: 1-15 共查到“知识库 原子与分子理论”相关记录62条 . 查询时间(3.854 秒)
中性原子成像仪的定标测试
能量中性原子 全能谱图 能谱半高宽 模数转换阈值
2018/5/4
中性原子成像仪（NAIS-H）获取的高时空分辨率图像可为地球空间磁暴和亚暴过程的各类机制研究提供全景式的空间粒子分布数据，为磁层与电离层耦合、磁层能量耗散等MIT（磁层elax-elax电离层elax-elax热层耦合小卫星星座探测计划）科学研究任务提供重要的数据支撑.探测器的标定是研制过程的一个重要技术环节，是日后空间探测数据分析和反演基本依据.本文利用模拟信号源对中性原子成像仪原理样机的前端电...
日冕能量中性原子编码调制成像方法应用
中性原子 成像观测 编码调制
2018/5/4
针对空间天气活动机理、机制及规律等方面研究需要，Kuafu卫星计划提出对日冕中性原子进行成像观测.通过分析日冕中性原子观测的科学意义和观测方法，采用编码调制方法进行日冕中性原子成像，并依据科学指标完成了整个仪器初步方案设计和仿真计算.仪器测量的中性原子能量范围为0.5~6MeV，视场范围为360°×10°.利用高压静电偏转电极板去除测量范围内的带电粒子，仪器由m序列编码调制栅网与硅半导体构成的成像...
GGX-9型原子吸收分光光度计常见故障与排除方法
GGX-9型 原子 光度
2014/7/9
原子吸收分光光度计因价格低、耗材便宜、易使用、易维护等特点，已成为常规实验室的必备仪器。ＧＧＸ－９型原子吸收分光光度计是北京地质仪器研究所（现北京海光仪器公司）于１９９７年推出的产品，在很多检测实验室得到广泛的应用。该型号仪器电路采用模块化设计，集成度高，主机内电路部分只有电源板和前置放大器板，大部分的工作都是由计算机完成，点灯控制、采样、启动Ａ／Ｄ转换等时序，均由一片特制的芯片来完成，提高了仪器...
Quasiclassical approach to high-energy QED processes in strong laser and atomic fields
Quasiclassical high-energy QED processes strong laser atomic fields Atomic Physics
2012/4/20
An approach, based on the use of the quasiclassical Green's function, is developed for investigating high-energy quantum electrodynamical processes in combined strong laser and atomic fields. Employin...
QED model of the radiation escape from the matter
QED model radiation escape the matter Atomic Physics
2012/4/20
A simple model based on QED is presented for the estimation of contribution of the excited level few-photon decays to the radiation escape from the matter in the epoch of the cosmological hydrogen rec...
QED theory of the multiphoton cascade transitions in atoms
QED theory the multiphoton cascade transitions atoms Atomic Physics
2012/4/20
QED theory of multiphoton cascade transitions in atoms and ions is developed. This theory allows for the accurate description of the process important for astrophysical studies of the cosmological hyd...
Buffer gas-assisted polarization spectroscopy of 6Li
Buffer gas-assisted polarization spectroscopy 6Li Atomic Physics
2012/4/20
We report on the demonstration of Doppler-free polarization spectroscopy of the D2 line of 6Li atoms. Counterintuitively, the presence of an Ar buffer gas, in a certain pressure range, causes a drasti...
Dielectronic recombination of W^20+ (4d^10 4f^8): addressing the half-open f-shell
Dielectronic recombination half-open f-shell Atomic Physics
2012/4/20
A recent measurement of the dielectronic recombination (DR) of W^20+ [Schippers et al Phys. Rev. A83, 012711 (2011)] found an exceptionally large contribution from near threshold resonances (<1eV). Th...
Study of Simulation Method of Time Evolution in Rigged QED
Study of Simulation Method Time Evolution Rigged QED Atomic Physics
2012/4/20
We discuss how we formulate time evolution of physical quantities in the framework of the Rigged QED (Quantum Electrodynamics). The Rigged QED is a theory which has been proposed to treat dynamics of ...
Storage and Retrieval of an Image using Four-Wave Mixing in a Cold Atomic Ensemble
Storage Retrieval of an Image Four-Wave Mixing Cold Atomic Ensemble
2012/4/19
We experimentally realized storage and retrieval of an image of light in a cigar-shaped atomic cloud of Rubidium 85 using four-wave mixing (FWM) for the first time. The input signal and the generated ...
Optical transitions in highly-charged californium ions with high sensitivity to variation of the fine-structure constant
Optical transitions highly-charged californium ions variation of the fine-structure constant Atomic Physics
2012/4/19
We study electronic transitions in highly-charged Cf ions that are within the frequency range of optical lasers and have very high sensitivity to potential variations in the fine-structure constant, a...
Laser stabilization to an atomic transition using an optically generated dispersive lineshape
Laser stabilization atomic transition optically generated dispersive lineshape Atomic Physics
2012/4/19
We report on a simple and robust technique to generate a dispersive signal which serves as an error signal to electronically stabilize a monomode cw laser emitting around an atomic resonance. We explo...
Observation of (N2)2 dimers in free nitrogen and argon-nitrogen clusters
(N2)2 dimers free nitrogen argon-nitrogen clusters
2011/8/4
Abstract: Supersonic-jet luminescence spectroscopy was applied to study vibronic transitions in icosahedral N2 and Ar-N2 clusters having from 100 to 400 particles per cluster. In the case of mixed Ar-...
Influence of the electrons on the stability of one-dimensional chains of metals
electrons one-dimensional chains metals
2011/8/4
Abstract: The physical model describing the influence of the electronic subsystem on the properties of one-dimensional chains of metal is presented. It is shown that depending on an interaction potent...
Technique for high axial shielding factor performance of large-scale, thin, open-ended, cylindrical Metglas magnetic shields
Metglas, magnetic shielding axial shielding factor transverse shielding factor
2011/8/4
Abstract: Metglas 2705M is a low-cost commercially-available, high-permeability Cobalt-based magnetic alloy, provided as a 5.08-cm wide and 20.3-$\mu$m thick ribbon foil. We present an optimized const...