Physics – Quantum Physics
Scientific paper
2011-07-24
Phys. Rev. Lett. 107, 273001 (2011)
Physics
Quantum Physics
final version, accepted for publication in Phys Rev Lett
Scientific paper
10.1103/PhysRevLett.107.273001
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.
Amaran Saieswari
Amitay Zohar
Koch Christiane P.
Kosloff Ronnie
Levin Liat
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