Microwave Spectroscopy of Ultracold Thulium Atoms

Magnetic fields are one of the main tools for controlling the interaction of ultracold atoms using the so-called Feshbach resonances. However, the accurate knowledge of magnetic fields within the high-vacuum chamber is significantly complicated due to the inexact knowledge of the setup geometry, the presence of magnetic parts, and other. In this paper, we demonstrate precision calibration of magnetic fields in the high-vacuum setup using microwave spectroscopy of the ground state of ultracold thulium atoms.     

Electron Impact Ionization Cross Section of Nitrogen Atoms

The direct ionization cross sections for electron scattering by nitrogen are calculated by applying an equivalentlocal optical model from 15eV to 1100eV. The present results are compared with the experimental data and other theoretical calculation results.     

Binding Energies in Electron Shells of Rare-Earth Atoms

Journal of Experimental and Theoretical Physics - Experimental data on the orbital binding energies in each of electron subshells of rare-earth elements from lanthanum to lutetium including the...     

固体激光器热透镜焦距的自适应补偿

It is suggested an improved method for measuring the velocity distribution of cold atoms, using FM technique to derive the signal from the recoil-induced resonance. The method is capable to measure velocity distribution of atoms cooled below the Doppler limit of laser cooling in a compact space with high S/N ratio.     

First Precision Spectroscopy of Pionic Atoms at RI Beam Factory

We conducted an inclusive missing-mass spectroscopy of ¹²²Sn (d, ³He) reaction near the π¯ emission threshold at an incident energy of T _d = 250 MeV/nucleon. The experiment sets its goals to the research and development of the high precision spectroscopy of pionic atoms at the RI beam factory (RIBF) of RIKEN, which precedes a new project, pionic atom factory project (piAF), to observe pionic atoms systematically. Here, we report the preliminary results of the pilot experiment.     

Feasibility of In-Trap Conversion Electron Spectroscopy

We have used REXTRAP at ISOLDE to test the feasibility of in-trap electron spectroscopy. The results of calculations, experiments with various electron sources as well as a first test with trapped radioactive ions are presented. This revised version was published online in July 2006 with corrections to the Cover Date.     

Electron Dynamics of Atoms in Parallel Electric and Magnetic Fields

Through an analysis of the nearest neighbor level fields, we investigate the evolution of the electron spacing statistics for atoms in parallel electric and magnetic dynamics as electric field strength increases. In the ＇inter-l mixing＇ predominant region, the electron shows complex dynamics while in the ＇inter-n mixing＇ predominant region, its dynamics behaves in a relatively stable way and the characteristic quantity ξ shows a slight oscillation. Comparing the dynamics for hydrogen and barium, we find that the core effect makes the main contribution to the chaotic behavior in non-hydrogen atoms.     

Spectroscopy of Rubidium Atoms in a Femtosecond Pulsed Optical Dipole Trap

JETP Letters - The spectral properties of atoms localized in an optical dipole trap formed by femtosecond pulsed radiation are studied experimentally. It is shown that the shift of the absorption...     

Temperature Measurements of Optically Cooled Calcium Atoms Using Differential Two-Photon Spectroscopy

Doklady Physics - A differential two-photon method of measuring the temperature of 40Ca atoms in a continuously operating magneto-optical trap is demonstrated. Coherent two-photon resonances at the...     

电场中Rydberg原子的常数标度能谱方法

标度能谱理论能够简化外场谱及可以经典方法理解原子外场谱而倍受关注。本文报道了用于电场中Rydberg原子常数标度能谱实验研究的装置以及有关的计算机控制、采集及处理系统。该系统对能量E和电场F进行同步控制以保持标度能谱ε=E/F为常数，并成功地得到Rydberg态Sr原子在标度能ε=-3.0时的标度能谱，经过傅里叶变换，获得了电场中Sr原子的电子回归谱。     

等离子体电子温度的发射光谱法诊断

电子温度是表征等离子体性质的一个重要参数。由于等离子体放电过程非常复杂,要实时准确测定其电子温度值非常困难。发射光谱法作为一种等离子体诊断技术,因其所使用的仪器相对简单,并采用非接触测量,灵敏度高,响应速度快,可广泛地应用于各种等离子体性质的研究和参数的诊断。文章介绍了测定等离子体电子温度的双谱线法、多谱线斜率法、等电子谱线法、Saha-Boltzmann法、谱线绝对强度法等多种发射光谱法,同时综述了这些方法在等离子体电子温度诊断中的应用,旨在为实际过程中选择合适的等离子体诊断方法提供参考。     

Fluorescence Correlation Spectroscopy Applied to the Measurement of Diffusion Coefficients of Atoms

The application of fluorescence correlation spectroscopy to the measurement of diffusion coefficients of atoms is proposed. After a theoretical analysis of the problem the experimental viability of this technique is studied in the particular case of Tl. Finally applications to other experiments such as ground state level-crossing are proposed.