High-Resolution “Magic”-Field Spectroscopy on Trapped Polyatomic Molecules,Physical Review Letters

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High-Resolution “Magic”-Field Spectroscopy on Trapped Polyatomic Molecules
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-10-18 , DOI: 10.1103/physrevlett.127.173602
Alexander Prehn ₁ , Martin Ibrügger ₁ , Gerhard Rempe ₁ , Martin Zeppenfeld ₁

Affiliation

Rapid progress in cooling and trapping of molecules has enabled first experiments on high-resolution spectroscopy of trapped diatomic molecules, promising unprecedented precision. Extending this work to polyatomic molecules provides unique opportunities due to more complex geometries and additional internal degrees of freedom. Here, this is achieved by combining a homogeneous-field microstructured electric trap, rotational transitions with minimal Stark broadening at a“magic” offset electric field, and optoelectrical Sisyphus cooling of molecules to the low millikelvin temperature regime. We thereby reduce Stark broadening on the

J = 5 \leftarrow 4

(

K = 3

) transition of formaldehyde at 364 GHz to well below 1 kHz, observe Doppler-limited linewidths down to 3.8 kHz, and determine the magic-field line position with an uncertainty below 100 Hz. Our approach opens a multitude of possibilities for investigating diverse polyatomic molecule species.

中文翻译：

捕获的多原子分子的高分辨率“魔术”场光谱

冷却和分子捕获方面的快速进展使第一次对捕获的双原子分子进行高分辨率光谱实验成为可能，有望实现前所未有的精度。由于更复杂的几何形状和额外的内部自由度，将这项工作扩展到多原子分子提供了独特的机会。在这里，这是通过将均匀场微结构电阱、在“神奇”偏移电场下具有最小斯塔克展宽的旋转跃迁以及分子光电西西弗斯冷却到低毫开尔文温度范围来实现的。因此，我们减少了 Stark 展宽