超稀气体透过率与探测器尺寸关系的测量
Measurement of the dependence of ultra diluted gas transmittance on the size of the detector
摘要：
我们表明，测得的超薄气体的光学透射率取决于检测器的大小。为此，我们进行了一个实验，比较透射率测量平行与不同的直径范围从2 $μ$ m到200 $μ$ m的探测器对。使用可调谐二极管激光吸收光谱型系统。$\sim$ 1 e-2 mbar水蒸气在NIR吸收线$λ$ =1368.60 nm上的透射率使用放置在300 l真空室内的60 m长的多程池测量。实验结果表明，当使用较小的探测器进行测量时，透射率较高。差异高达1.23 $\pm$ 0.1%，大于0，具有>5 $σ$的统计学显著性。定性地说，它与最近发展的薄气体光学透射率模型一致，该模型考虑了单个气体粒子的波函数扩展的量子力学效应。
英文摘要：
We show that measured optical transmittance of an ultra thin gas depends on the detector size. To this end we conducted an experiment that compares transmittances measured in parallel with a pair of detectors with different diameters ranging from 2 $μ$m to 200 $μ$m. A Tunable Diode Laser Absorption Spectroscopy type system was used. Transmittance of $\sim$1e-2 mbar water vapor on NIR absorption line $λ$=1368.60 nm was measured using a 60 m long multi-pass cell placed inside the 300 l vacuum chamber. The result of the experiment shows higher transmittances when the measurement is performed using smaller detectors. The difference reaches as much as 1.23 $\pm$0.1 %, which is greater than 0 with >5$σ$ statistical significance. Qualitatively it is in agreement with the recently developed model of thin gas optical transmittance taking into account the quantum mechanical effects of spreading of the wave functions of individual gas particles.
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