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首页> 外文期刊>Physical Review X >Half-Collision Approach to Cold Chemistry: Shape Resonances, Elastic Scattering, and Radiative Association in the H + + H and D + + D Collision Systems
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Half-Collision Approach to Cold Chemistry: Shape Resonances, Elastic Scattering, and Radiative Association in the H + + H and D + + D Collision Systems

机译：冷化学的半碰撞方法：H + + H和D + + D碰撞系统中的形状共振，弹性散射和辐射关联

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The H + + H and D + + D collisions represent the simplest examples of collisions involving identical fermions and bosons, respectively. We report a study of these collisions in the range of energies corresponding to 0–40?K at a resolution of 100?mK based on a half-collision approach. Using the technique of pulsed-field-ionization zero-kinetic-energy photoelectron spectroscopy (PFI-ZEKE-PES), which relies on the pulsed field ionization of nonpenetrating Rydberg states of very high principal quantum number ( n ≥ 250 ), we have measured the positions and widths of all low-lying shape resonances of this collision and compare them with the results of ab?initio calculations that consider nonadiabatic, relativistic, and radiative corrections to the Born-Oppenheimer energies. Excellent agreement between calculated and measured widths and positions is found except for the X + ( v + = 25 , N + = 8 ) shape resonance, the width of which is calculated to be narrower than observed. Comparison with similar observations made for the H + + H collision [Beyer and Merkt Phys. Rev. Lett. 116, 093001 (2016) ] indicates that the shape resonances measured by PFI-ZEKE-PES are broadened by the effects of the localization of the charge of the dissociating ion core arising from a nonadiabatic coupling between ion core and Rydberg electron. A simple model is presented that enables one to predict which shape resonances are likely to be affected and to correct for the resulting broadening. Two shape resonances of D 2 + , the X + ( v + = 26 , N + = 5 ) and the A + ( v + = 0 , N + = 5 ) resonances, have electric-dipole-allowed transitions to bound states of D 2 + and are shown to facilitate the radiative association at low temperature. The results are used to determine the elastic cross sections of the H + + H and D + + D collisions for partial waves up to N + = 11 and the radiative-association cross sections and rate constants in the range between 10?mK and 100?000?K.
机译：H + + H和D + + D碰撞分别表示涉及相同的费粒和玻色子的碰撞的最简单示例。我们报告了对应于0-40？K的能量范围内这些碰撞的研究，该碰撞是基于半碰撞方法的100×MK的分辨率。使用脉冲场电离零型电能光电子谱（PFI-Zeke-PE）的技术，依赖于非常高的主量子数（n≥250）的非旋转rydberg状态的脉冲场电离，我们测量了这种碰撞的所有低位形状共振的位置和宽度，并将它们与AB的结果进行比较，以考虑对出生的oppenheimer能量的非等压，相对论和辐射校正。除了x +（v + = 25，n + = 8）形状共振之外，找到计算和测量宽度和位置之间的良好一致性，其宽度计算为比观察到的宽度窄。与类似观察结果的比较，为H + + H碰撞[Beyer和Merkt phys。 rev. lett。 116,093001（2016）]表示通过从离子核和Rydberg电子之间产生的解离离子核心的电荷的定位的效果来扩大由PFI-Zeke-PE测量的形状共振。提出了一种简单的模型，使得能够预测其可能受到影响的形状共振并且校正所得到的展大。 D 2 +的两个形状共振，x +（v + = 26，n + = 5）和a +（v + = 0，n + = 5）共振，使电偶极允许转换到绑定状态D 2 +并显示为促进低温辐射关联。结果用于确定H + + H和D + + D碰撞的弹性横截面，用于偏波至N + = 11，辐射关联横截面和速率常数在10？MK和100之间的范围内？000？k。

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