钠-钠和钠-惰性气体分子吸收的精密测量
Precision measurements of sodium-sodium and sodium-noble gas molecular absorption
摘要：
本文介绍了钠-惰性气体混合气体吸收精密测量的实验装置和测量技术.在425 nm至760 nm波长范围内测量绝对吸收系数，不确定度为2%，光谱分辨率为0.02 nm。通过使用专门设计的吸收池，具有精确定义的吸收路径长度，低噪声CCD检测器和双光束吸收测量方案来实现精度。给出了实验装置和电池设计细节。钠原子序数密度的测量与5%的不确定性补充吸收系数的测量，并允许推导出某些光谱特征的减少的吸收系数。钠的原子序数密度是用反常色散法测量的。通过对CCD探测器记录的干涉图像进行最小二乘拟合，提高了该方法的精度，并给出了该方法的细节。测量的目的是严格测试的理论计算和提高计算中使用的分子参数的值。
英文摘要：
Experimental apparatus and measurement technique are described for precision absorption measurements in sodium - noble gas mixtures. The absolute absorption coefficient is measured in the wavelength range from 425 nm to 760 nm with 2% uncertainty and spectral resolution of 0.02 nm. The precision is achieved by using a specially designed absorption cell with an accurately defined absorption path length, low noise CCD detector and double-beam absorption measurement scheme. The experimental set-up and the cell design details are given. Measurements of sodium atomic number density with 5% uncertainty complement absorption coefficient measurements and allow derivation of the reduced absorption coefficients for certain spectral features. The sodium atomic number density is measured using the anomalous dispersion method. The accuracy of this method is improved by employing a least-squares fit to the interference image recorded with CCD detector and the details of this technique are given. The measurements are aimed at stringent testing of theoretical calculations and improving the values of molecular parameters used in calculations.
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