相关实验视频
Updated: May 29, 2025

11:21
Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
7.4K
在超冷状态之外,对离子-原子碰撞的量子控制
Maks Z Walewski1, Matthew D Frye1, Or Katz2
1Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland.
Science advances
|February 5, 2025
概括
研究人员在1毫克尔文的离子-鲁比原子碰撞中发现了Feshbach共振. 这一发现使得在更高的温度下精确控制原子和分子系统,进步了量子技术.
科学领域:
- 原子,分子和光学物理学
- 量子信息科学 量子信息科学
- 化学物理 化学物理
背景情况:
- 可调节的散射共振对于控制原子和分子系统至关重要,但通常需要超低温.
- 混合捕获的离子原子系统为量子技术提供了一个有前途的平台,但很难冷却到超低温条件.
- 之前的研究受到了限制,因为对于离子-原子系统来说,实现和保持超低温的难度很大.
研究的目的:
- 调查离子 (Sr+) 和原子 (Rb) 碰撞的不弹性碰撞概率.
- 开发和校准一个关于离子-原子碰撞的全面理论模型.
- 在可访问的温度下识别和描述Sr+Rb系统中的Feshbach共振.
主要方法:
- 实验测量了Sr+ + Rb. 的无弹性碰撞概率.
- 对离子-原子碰撞的全面理论模型的开发,与实验数据进行校准.
- 在各种磁场和原子超细状态中理论地探索Feshbach共振.
主要成果:
- 离子-原子碰撞中的量子干扰效应持续到多个部分波模式,显示状态和质量依赖.
- 在中度磁场下的Sr+Rb碰撞中发现了丰富的Feshbach共振谱.
- 预计这些共振会在高达1毫克尔文的温度下持续存在,比以前可以达到的温度要高得多.
结论:
- 这项研究表明,在相对温暖的条件下 (1mK) 的离子原子碰撞中可以观察到Feshbach共振.
- 开发的理论模型准确地描述了离子-原子碰撞动态,包括量子干扰.
- 未来对这些预测共振的观测将使Sr+Rb系统的短距离动态能够精确控制,从而推进量子技术.
相关概念视频
The Quantum-Mechanical Model of an Atom
41.8K
Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
41.8K
The de Broglie Wavelength
25.3K
In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
25.3K
Atomic Absorption Spectroscopy: Atomization Methods
358
Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
358
Hybridization of Atomic Orbitals II
31.7K
sp3d and sp3d 2 Hybridization
31.7K
Atomic Spectroscopy: Effects of Temperature
286
Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature...
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature...
286
Atomic Nuclei: Nuclear Relaxation Processes
603
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.
603

