发表机构
Istituto Nazionale di Fisica Nucleare; University of Ferrara; University of Padua; National Quantum Science and Technology Institute（意大利国家核物理研究所; 费拉拉大学; 帕多瓦大学; 国家量子科学与技术研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出一种低温装置，在低至3.2 K的氖晶体中生长BaF基质，用于电子电偶极矩测量，并首次估计柱密度，同时演示仲氢缓冲气体产生BaF，为未来研究奠定基础。
AI 中文摘要
我们提出了一种用于基质隔离光谱研究的新型实验装置，该装置能够生长掺杂有氟化钡（BaF）的低温晶体基质，BaF是测量电子电偶极矩（eEDM）的候选分子。在本工作中，BaF分子在低温缓冲气体源中产生，并用于掺杂生长在基底上的氖基质，该基底由低温冷却器冷却，温度可低至3.2 K。可旋转法兰允许多种基底取向，从而优化光谱研究和基质晶体的生长。对氖晶体中BaF的荧光发射分析表明，当激发A²Π₁/₂、A²Π₃/₂和B²Σ⁺态时，存在发射，同时晶体中还存在钡原子的荧光。首次估计了晶体中BaF的柱密度，约为5×10⁻¹³ cm⁻²。我们还演示了使用仲氢作为低温源的缓冲气体来产生BaF，这是将BaF分子嵌入仲氢基质的第一步。最后，我们还观察到快速的荧光衰减，这归因于光学漂白效应，其幅度在较低温度或较高激光强度下出现，这引入了在未来实验中需要研究的系统效应。
英文摘要
We present a new experimental apparatus for matrix isolation spectroscopy capable of growing cryogenic crystal matrices doped with barium monofluoride (BaF), a candidate for measurements of the electron electric dipole moment (eEDM). \\ In this work, BaF molecules are produced in a cryogenic buffer-gas source and used to dope a neon matrix grown on a substrate, cooled by a cryocooler, reaching temperatures as low as 3.2 K. A rotatable flange allows for multiple substrate orientations, optimizing spectroscopic investigations and matrix crystal growth. \\ Fluorescence emission analysis of BaF in neon crystal show emission when exciting the $A\,^2Π_{1/2}$, $A\,^2Π_{3/2}$ and $B\,^2Σ^+$ states, along with the presence of fluorescence from barium atoms in the crystal. A first estimation of the column density of BaF in the crystal is given on the order of $5 \times 10^{-13} \, \text{cm}^{-2}$. \\ We also demonstrated the production of BaF using parahydrogen as the buffer gas of the cryogenic source, a first step toward BaF molecules embedded in a para-hydrogen matrix. \\ Finally, we also observed fast fluorescence decay, attributed to optical bleaching effects, whose amplitude arise at lower temperatures or higher laser intensities, introducing a systematic effect to be studied in future experiments.
