期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
基于原子拉比共振的原子气室弛豫率测量
1
作者 闵霁驰 金双浩 +2 位作者 江文松 茹宁 罗哉 《计量学报》 CSCD 北大核心 2023年第4期604-608,共5页
原子气室是量子精密测量仪器中的核心部件,原子弛豫率是原子气室的重要参数之一。针对原子弛豫率的测量,通过Comsol Multiphysics软件设计了一个微波腔,并模拟了原子气室内的微波传播过程,验证了微波腔设计的合理性。并搭建了一套测量... 原子气室是量子精密测量仪器中的核心部件,原子弛豫率是原子气室的重要参数之一。针对原子弛豫率的测量,通过Comsol Multiphysics软件设计了一个微波腔,并模拟了原子气室内的微波传播过程,验证了微波腔设计的合理性。并搭建了一套测量原子气室弛豫率的系统,用快速傅里叶变换分析仪(FFT)测得了拉比共振的线型。通过处理实验数据,得到了原子气室弛豫率,比理论计算原子弛豫率更加方便准确。 展开更多
关键词 计量学 弛豫率 拉比共振 微波腔 原子气室
下载PDF
基于原子拉比共振的自由空间微波磁场探测研究 被引量:3
2
作者 茹宁 刘小赤 +2 位作者 蒋志远 段俊毅 屈继峰 《计量技术》 2020年第5期19-24,共6页
基于拉比共振的微波磁场测量技术,实现了在充入缓冲气体的铯原子气室和表面镀抗驰豫涂层的铷原子气室中测量微波磁场。我们开发了一套针对表面镀抗弛豫涂层的铷原子气室的实验装置,成功探测到铯原子和铷原子与相位调制的微波磁场相互作... 基于拉比共振的微波磁场测量技术,实现了在充入缓冲气体的铯原子气室和表面镀抗驰豫涂层的铷原子气室中测量微波磁场。我们开发了一套针对表面镀抗弛豫涂层的铷原子气室的实验装置,成功探测到铯原子和铷原子与相位调制的微波磁场相互作用时的拉比共振信号谱线。实验中对入射光强度和原子气室加热温度等参数进行了详细的研究和表征。得到了拉比共振信号幅值和线宽的最优值,实验结果与理论值相符合。 展开更多
关键词 拉比共振 微波磁场 相位调制 原子气室 缓冲气体 抗弛豫涂层
原文传递
How to reach the orbital configuration of the inner three planets in HD 40307 planet system?
3
作者 CHEN YuanYuan ZHOU JiLin MA YueHua 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2015年第3期102-108,共7页
The formation of the present configuration of three hot super-Earths in the planet system HD 40307 is a challenge to dynamical astronomers.With the two successive period ratios both near and slightly larger than 2,the... The formation of the present configuration of three hot super-Earths in the planet system HD 40307 is a challenge to dynamical astronomers.With the two successive period ratios both near and slightly larger than 2,the system may have evolved from pairwise2:1 mean motion resonances(MMRs).In this paper,we investigate the evolutions of the period ratios of the three planets after the primordial gas disk was depleted.Three routines are found to probably result in the current configuration under tidal dissipation with the center star,they are:(i)through apsidal alignment only;(ii)out of pairwise 2:1 MMRs,then through apsidal alignment;(iii)out of the 4:2:1 Laplace Resonance(LR),then through apsidal alignment.All the three scenarios require the initial eccentricities of planets~0.15,which implies a planetary scattering history during and after the gas disk was depleted.All the three routines will go through the apsidal alignment phase,and enter a state with near-zero eccentricities finally.We also find some special characteristics for each routine.If the system went through pairwise 2:1 MMRs at the beginning,the MMR of the outer two planets would be broken first to reach the current state.As for routine(iii),the planets would be out of the LR at the place where some high-order resonances are located.At the high-order resonances 17:8 or 32:15 of the planets c and d,the system will possibly enter the current state as the final equilibrium. 展开更多
关键词 planets and satellites: formation planets and satellites: HD40307
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部