相关实验视频
Updated: Jul 13, 2025

11:21
Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
7.5K
单个H_{2}^{+}的捕获和地面状态冷却
N Schwegler1, D Holzapfel1, M Stadler1
1Institute for Quantum Electronics, Department of Physics, Eidgenössische Technische Hochschule Zürich, Otto-Stern-Weg 1, 8093 Zurich, Switzerland.
Physical review letters
|October 13, 2023
概括
我们在冷陷中实现了分子离子 (H_{2}^{+}) 的长期化学稳定性,为未来的光离子量子光谱实验提供了精确的冷却.
科学领域:
- 原子,分子和光学 (AMO) 物理学
- 量子信息科学 量子信息科学
- 实验物理实验物理学
背景情况:
- 精确控制分子离子对于量子技术至关重要.
- 分子离子的长化学寿命对于先进的光谱技术至关重要.
- 低温环境是实现高保真量子实验的关键.
研究的目的:
- 为了证明分子离子 (H_{2}^{+}) 和离子 ({}^{9}Be^{+}) 对的共同捕捉和侧带冷却.
- 在冷温度下研究H_{2}^{+}的化学寿命.
- 建立H_{2}^{+}和类似的轻分子离子量子逻辑光谱学的基础.
主要方法:
- 使用冷保罗陷用于离子封闭和冷却.
- 采用侧带冷却技术来减少转移运动.
- 监测H_{2}^{+}的化学寿命,作为装置温度的函数.
主要成果:
- 在10K的温度下,化学寿命达到H_{2}^{+}至11_{-3}^{+6}小时.
- 冷却了两个转换模式,使平均语音数值为0.07(1) 和0.05(1).
- 在冷却模式下达到22(1) μK和55(3) μK的温度.
结论:
- 展示的共同捕捉和冷却技术为H_{2}^{+}量子逻辑光谱学提供了一个强大的平台.
- 这项工作为精确测量其他轻分子离子,如HD^{+},H_{3}^{+},He^{+}等铺平了道路.
- 取得的长期化学稳定性是迈向复杂分子离子量子应用的重要一步.
相关概念视频
Atomic Nuclei: Nuclear Spin State Population Distribution
993
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
993
Atomic Nuclei: Nuclear Relaxation Processes
661
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis.
661
Double Resonance Techniques: Overview
233
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
233
¹³C NMR: ¹H–¹³C Decoupling
1.1K
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
1.1K
Molecular Orbital Theory II
19.3K
Molecular Orbital Energy Diagrams
19.3K
Deactivation Processes: Jablonski Diagram
696
Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
696

