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arXiv 1404.4292physics.atom-phphysics.chem-ph
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芯片上的冷分子离子

Cold molecular ions on a chip

A. Mokhberi, S. Willitsch

摘要:

我们报道了离子阱芯片表面上分子离子的感应冷却和库仑结晶。N $_2^+$和CaH $^+$离子被限制在表面电极射频离子阱中,并通过与激光冷却的Ca $^{+}$离子的相互作用冷却到毫开尔文范围内的长期平移温度。由表面电极产生的捕获电势的配置使得能够形成平面双组分库仑晶体和分子从芯片上的原子离子的空间分离。利用分子动力学模拟对库仑晶体的结构和热性能进行了表征。本研究将基于芯片的捕获技术扩展到库仑结晶分子离子,在质谱、冷化学、量子信息科学和光谱学中具有潜在的应用。

英文摘要:

We report the sympathetic cooling and Coulomb crystallization of molecular ions above the surface of an ion-trap chip. N$_2^+$ and CaH$^+$ ions were confined in a surface-electrode radiofrequency ion trap and cooled by the interaction with laser-cooled Ca$^{+}$ ions to secular translational temperatures in the millikelvin range. The configuration of trapping potentials generated by the surface electrodes enabled the formation of planar bicomponent Coulomb crystals and the spatial separation of the molecular from the atomic ions on the chip. The structural and thermal properties of the Coulomb crystals were characterized using molecular dynamics simulations. The present study extends chip-based trapping techniques to Coulomb-crystallized molecular ions with potential applications in mass spectrometry, cold chemistry, quantum information science and spectroscopy.

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