Quantitative atomic spectroscopy for primary thermometry
Quantitative atomic spectroscopy for primary thermometry
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DOI：
10.1103/physreva.83.033805
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发表时间：
2010-08
影响因子：
2.9
通讯作者：
G. Truong;E. May;T. Stace;A. Luiten
中科院分区：
文献类型：
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作者：
G. Truong;E. May;T. Stace;A. Luiten
本文用定量光谱法精确测量了{sup 85}Rb蒸气中原子跃迁的多普勒展宽。通过使用传统的铂电阻温度计和多普勒测温技术，我们能够确定k{sub B}，相对不确定度为4.1 × 10 {sup -4}，与预期值的偏差为2.7 × 10 {sup -4}。我们的实验，使用一个溢出的蒸汽，从其他多普勒展宽测温（DBT）技术，依赖于弱吸收分子的扩散制度显着出发。在这些情况下，非常不同的系统效应，如磁灵敏度和光泵浦是占主导地位的。利用Stace和Luiten最近发展的模型，我们估计由于光抽运而引起的测量的k{sub B}值的扰动小于4 × 10 {sup-6}。光泵浦对原子和分子DBT实验的影响映射在很宽的光束尺寸和饱和强度范围内，表明可能的改进途径。我们还比较了最近的一些DBT实验的线加宽机制，操作窗口和检测限。
Quantitative spectroscopy has been used to measure accurately the Doppler broadening of atomic transitions in {sup 85}Rb vapor. By using a conventional platinum resistance thermometer and the Doppler thermometry technique, we were able to determine k{sub B} with a relative uncertainty of 4.1x10{sup -4} and with a deviation of 2.7x10{sup -4} from the expected value. Our experiment, using an effusive vapor, departs significantly from other Doppler-broadened thermometry (DBT) techniques, which rely on weakly absorbing molecules in a diffusive regime. In these circumstances, very different systematic effects such as magnetic sensitivity and optical pumping are dominant. Using the model developed recently by Stace and Luiten, we estimate the perturbation due to optical pumping of the measured k{sub B} value was less than 4x10{sup -6}. The effects of optical pumping on atomic and molecular DBT experiments is mapped over a wide range of beam size and saturation intensity, indicating possible avenues for improvement. We also compare the line-broadening mechanisms, windows of operation and detection limits of some recent DBT experiments.