利用热原子双光子飞秒光缔合产生分子振转相干
Generating Molecular Rovibrational Coherence by Two-Photon Femtosecond Photoassociation of Thermally Hot Atoms
摘要：
在自由-束缚双光子飞秒光缔合反应中，实验证明了具有转动和振动相干性的双原子分子的形成。在温度为1000 K的热气体中，镁原子对在其电子基态中碰撞，被激发成在电子激发态中的束缚振转能级的相干叠加。振转相干探测的时间延迟的第三个光子，导致在紫外荧光量子拍。一个全面的理论模型从头计算的基础上合理化的碰撞能量和分波的弗兰克-康登过滤的相干性的产生，量化它在热合奏的量子纯度的增加方面。我们的研究结果开辟了一条道路，相干控制的二元反应。
英文摘要：
The formation of diatomic molecules with rotational and vibrational coherence is demonstrated experimentally in free-to-bound two-photon femtosecond photoassociation of hot atoms. In a thermal gas at a temperature of 1000 K, pairs of magnesium atoms, colliding in their electronic ground state, are excited into coherent superpositions of bound rovibrational levels in an electronically excited state. The rovibrational coherence is probed by a time-delayed third photon, resulting in quantum beats in the UV fluorescence. A comprehensive theoretical model based on ab initio calculations rationalizes the generation of coherence by Franck-Condon filtering of collision energies and partial waves, quantifying it in terms of an increase in quantum purity of the thermal ensemble. Our results open the way to coherent control of a binary reaction.
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