通过量子干扰控制反应碰撞
Hyungmok Son1,2, Juliana J Park1, Yu-Kun Lu1
1MIT-Harvard Center for Ultracold Atoms, Research Laboratory of Electronics, Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
概括
科学家在超冷和混合物中实现了对化学反应的磁性控制. 他们精确调整了反应速率, 展示了使用磁场对分子碰撞的前所未有的量子控制.
科学领域:
- 原子,分子和光学物理学
- 量子化学
- 超冷的量子气体
背景情况:
- 分子碰撞通常会导致接近单元的反应或损失,称为普遍率.
- 在完全旋极状态下, (Na) + (NaLi) 系统表现出较低的损失概率 (~4%),偏离了普遍的行为.
研究的目的:
- 在超冷的Na + NaLi混合物中研究和证明磁性控制.
- 探索分子碰撞损失率超出宇宙极限的变化.
主要方法:
- 使用Feshbach共振来精确控制散射波函数的相位.
- 使用磁场调整超冷原子和分子气体的相互作用.
主要成果:
- 在超冷的Na + NaLi中实现了对反应性散射的磁控制.
- 修改了损失率超过两个数量级 (100的因素),从普遍限制的下方延伸到上方.
- 观察到类似于光学Fabry-Perot共振器的干扰效应.
结论:
- 使用磁场证明了化学反应速度的量子控制.
- 在分子碰撞中对磁性控制的全部动态范围进行了验证的理论预测.
- 在量子层面控制化学过程的新途径.
相关概念视频
Types of Collisions - II
8.2K
When two or more objects collide with each other, they can stick together to form one single composite object (after collision). The total mass of the object after the collision is the sum of the masses of the original objects, and it moves with a velocity dictated by the conservation of momentum. Although the system's total momentum remains constant, the kinetic energy decreases, and thus such a collision is an inelastic collision. Most of the collisions between objects in daily life are...
8.2K
Types Of Collisions - I
7.6K
When two objects come in direct contact with each other, it is called a collision. During a collision, two or more objects exert forces on each other in a relatively short amount of time. A collision can be categorized as either an elastic or inelastic collision. If two or more objects approach each other, collide and then bounce off, moving away from each other with the same relative speed at which they approached each other, the total kinetic energy of the system is said to be conserved. This...
7.6K
The de Broglie Wavelength
28.8K
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...
28.8K
Interference and Superposition of Waves
5.6K
When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
5.6K
Predicting Reaction Outcomes
8.7K
Kinetics describes the rate and path by which a reaction occurs. In contrast, thermodynamics deals with state functions and describes the properties, behavior, and components of a system. It is not concerned with the path taken by the process and cannot address the rate at which a reaction occurs. Although it does provide information about what can happen during a reaction process, it does not describe the detailed steps of what appears on an atomic or a molecular level. On the other hand,...
8.7K
The Uncertainty Principle
26.8K
Werner Heisenberg considered the limits of how accurately one can measure properties of an electron or other microscopic particles. He determined that there is a fundamental limit to how accurately one can measure both a particle’s position and its momentum simultaneously. The more accurate the measurement of the momentum of a particle is known, the less accurate the position at that time is known and vice versa. This is what is now called the Heisenberg uncertainty principle. He...
26.8K


