用于聚焦低温$^{205}$TlF分子束的静电四极透镜

中文摘要 AI 辅助

利用分子进行精密测量需要具有高通量和窄发散度的分子束。本文介绍了用于聚焦低温$^{205}$TlF分子束的静电四极透镜（EQL）的设计、实现与表征。该EQL由四个电极组成，电极以空间交替电位运行，最高可达$\pm 30$ kV。这种配置产生横向恢复力，可聚焦制备在选定超精细态流形中的分子。在最佳施加电压下，EQL在当前探测位置将探测到的分子信号增强了$14.4(4)$倍。测得的透镜增益、横向多普勒谱和横向空间分布均能由使用独立测量的束流参数作为输入的轨迹模拟所重现。基于这一一致性，我们预测在完整的$7.9~\mathrm{m}$ CeNTREX束线上增益为$16.5(8)$。这些结果确立了EQL作为提高使用极性分子低温束的精密实验灵敏度的关键组件。

英文摘要

Precision measurements with molecules require molecular beams with high flux and narrow divergence. Here we present the design, implementation, and characterization of an electrostatic quadrupole lens (EQL) for focusing a cryogenic beam of $^{205}$TlF molecules. The EQL consists of four electrodes operated at spatially alternating potentials up to $\pm 30$ kV. This configuration generates a transverse restoring force that focuses molecules prepared in selected manifold of hyperfine states. At the optimal applied voltage, the EQL increases the detected molecular signal by a factor of $14.4(4)$ at the current detection position. The measured lens gain, transverse Doppler spectra, and transverse spatial profiles are all reproduced by trajectory simulations using independently measured beam parameters as input. Based on this agreement, we project a gain of $16.5(8)$ for the full $7.9~\mathrm{m}$ CeNTREX beamline. These results establish the EQL as a key component for increasing sensitivity in precision experiments using cryogenic beams of polar molecules.

发表机构

• Columbia University（哥伦比亚大学）
• Argonne National Laboratory（阿贡国家实验室）
• Johns Hopkins University（约翰斯·霍普金斯大学）
• Yale University（耶鲁大学）
• University of Massachusetts Amherst（马萨诸塞大学阿默斯特分校）
• University of Chicago（芝加哥大学）

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