项目名称: 基于原子气体吸收谱线多普勒展宽实现玻尔兹曼常数的高精度测定
项目编号: No.91536115
项目类型: 重大研究计划
立项/批准年度: 2016
项目学科: 数理科学和化学
项目作者: 高韶燕
作者单位: 西安交通大学
项目金额: 90万元
中文摘要: 物理常数的高精度测定是许多新物理规律发现的端倪,是物理学研究及各类计量标准的基础,具有十分重大的科学意义和应用价值。本项目研究利用可控增益原子介质的强色散性质实现高灵敏、高分辨率的光学干涉仪,发展激光谱线的高精度锁定和线宽控制新方法;在高精度测定原子气体吸收谱线的基础上,建立新的光谱展宽拟合线型,高精度标定多普勒展宽,从而使玻尔兹曼常数的测量精确度进一步提高。本项目的开展将为温度的重新定义提供精确的标准。
中文关键词: 高精密测量;玻尔兹曼常数;激光吸收谱线多普勒增宽测量法;光谱分析;干涉仪
英文摘要: Precision determination of fundamental physical constants, which is the origin of the discoveries of lots of physical new laws, and the foundation of the physical research and the metrology standard, is great significant in science and invaluable in application. This project investigates the principles of high sensitivity and resolution optical interferometer based on the strong dispersion of atomic ensemble with electromagnetically induced transparent amplification, develop a novel method of controlling laser linewidth and locking laser frequency from the high precision laser spectroscopy. Based upon high precision laser spectroscopy, Doppler width from the highly accurate observation of the profile corresponding to a given atomic line in a gas sample at thermometric equilibrium will be retrieved, thus, the high precision determination of Boltzmann constant can be implemented. This project will provide a solid base for redefining the standard of temperature.
英文关键词: high precision determination;Boltzmann constant;Doppler Broadening Thermometry (DBT); spectrum analysis;interferometer