在振动不弹性的Ar+N碰撞中通过硬碰撞光荣散射来进行挫折的电荷转移
Guodong Zhang1,2, Dandan Lu3, Min Cheng1,2
1Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing, China.
Nature communications
|September 17, 2024
概括
离子中性碰撞中的振动能量转移挑战了现有的模型. 新的实验显示,前向散射占主导地位,由电荷转移和硬碰撞光荣机制在离子和分子碰撞中驱动.
科学领域:
- 化学物理 化学物理
- 原子和分子碰撞 原子和分子碰撞
- 天体化学是天体化学.
背景情况:
- 振动能量转移在天体物理和等离子体环境中至关重要.
- 目前的模型预测了眼碰撞的前向散射和硬碰撞的后向散射.
研究的目的:
- 为了研究离子中性碰撞中振动能量转移的散射动态.
- 挑战对碰撞冲击参数和散射结果的传统理解.
主要方法:
- 使用3D速度图像成像交叉束装置进行实验观测.
- 理论分析与轨迹表面跳跃计算.
主要成果:
- 观察到,在Ar++N2碰撞中,振动激发的N2产物主要是向前分散的.
- 计算重现了实验结果,确定了短暂的电荷转移作为主要的激发机制.
- 证明了硬碰撞光荣机制在振动激发中的重要作用.
结论:
- 这项研究与在离子中性碰撞中振动能量转移的教科书模型相矛盾.
- 短暂的电荷转移和硬碰撞光荣机制是理解Ar++N2碰撞中的振动激发的关键.
更多相关视频
相关概念视频
Elastic Collisions: Introduction
12.3K
An elastic collision is one that conserves both internal kinetic energy and momentum. Internal kinetic energy is the sum of the kinetic energies of the objects in a system. Truly elastic collisions can only be achieved with subatomic particles, such as electrons striking nuclei. Macroscopic collisions can be very nearly, but not quite, elastic, as some kinetic energy is always converted into other forms of energy such as heat transfer due to friction and sound. An example of a nearly...
12.3K
Impact
137
Impact occurs when two bodies collide, leading to the application of impulsive forces between them. Analyzing impact mechanics involves considering two colliding particles moving along a line known as the line of impact, which passes through their centers and is perpendicular to the contact plane.
When particles with different initial velocities collide, they induce deformation by applying equal and opposite impulses. At the point of maximum deformation, the particles move together with...
When particles with different initial velocities collide, they induce deformation by applying equal and opposite impulses. At the point of maximum deformation, the particles move together with...
137
Types of Collisions - II
7.3K
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...
7.3K
Carrier Generation and Recombination
544
Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
544
Elastic Collisions: Case Study
13.6K
Elastic collision of a system demands conservation of both momentum and kinetic energy. To solve problems involving one-dimensional elastic collisions between two objects, the equations for conservation of momentum and conservation of internal kinetic energy can be used. For the two objects, the sum of momentum before the collision equals the total momentum after the collision. An elastic collision conserves internal kinetic energy, and so the sum of kinetic energies before the collision equals...
13.6K
Arrhenius Plots
38.9K
The Arrhenius equation relates the activation energy and the rate constant, k, for chemical reactions. In the Arrhenius equation, k = Ae−Ea/RT, R is the ideal gas constant, which has a value of 8.314 J/mol·K, T is the temperature on the kelvin scale, Ea is the activation energy in J/mole, e is the constant 2.7183, and A is a constant called the frequency factor, which is related to the frequency of collisions and the orientation of the reacting molecules.
The Arrhenius equation can be used...
The Arrhenius equation can be used...
38.9K


