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The European Physical Journal D

Orientation of Cs 6p 2P3/2 atomic photofragments in a magnetic field: interference in the photodissociation of diatomic molecules

Y. Kimura

Published Dec 19, 2005• 0 citations
Publisher
DOI
10.1140/epjd/e2005-00332-1

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Preferential population of magnetic sublevels of photodissociated atoms. I. Predissociation of Cs2

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Preferential population of the magnetic sublevels of Cs(6p 2P3/2) atoms produced by predissociation of the C 1Πu state of the Cs2 molecule along the repulsive molecular state b 3Σ+u , has been found by observing the polarization of the atomic fluorescence Cs(6p 2Pm3/2→6s 2S1/2). By applying an external magnetic field, we have determined the population of the magnetic sublevels Cs(6p 2Pm3/2) directly from the intensities of the fluorescence lines Cs(6p 2Pm3/2 →6s 2Sm±11/2 ) split by the Zeeman effect. The results are analyzed theoretically by assuming the separability of electronic and nuclear motion for the dissociation along the repulsive potential curve. The effect of the external magnetic field on the photodissociation has been made clear, and the observed results could be fully explained on the basis of the adiabatic approximation.

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Control of Ultracold Photodissociation with Magnetic Fields

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Photodissociation of a molecule produces a spatial distribution of photofragments determined by the molecular structure and the characteristics of the dissociating light. Performing this basic reaction at ultracold temperatures allows its quantum mechanical features to dominate. In this regime, weak applied fields can be used to control the reaction. Here, we photodissociate ultracold diatomic strontium in magnetic fields below 10 G and observe striking changes in photofragment angular distributions. The observations are in excellent agreement with a multichannel quantum chemistry model that includes nonadiabatic effects and predicts strong mixing of partial waves in the photofragment energy continuum. The experiment is enabled by precise quantum-state control of the molecules.

arXiv:1709.04527•Physical Review Letters•Jan 16, 2018•10 citations
Preferential population of the magnetic sublevels of Cs(6p 2P3/2) atoms produced by predissociation of the C 1Πu state of the Cs2 molecule along the repulsive molecular state b 3Σ+u , has been found by observing the polarization of the atomic fluorescence Cs(6p 2Pm3/2→6s 2S1/2). By applying an external magnetic field, we have determined the population of the magnetic sublevels Cs(6p 2Pm3/2) directly from the intensities of the fluorescence lines Cs(6p 2Pm3/2 →6s 2Sm±11/2 ) split by the Zeeman effect. The results are analyzed theoretically by assuming the separability of electronic and nuclear motion for the dissociation along the repulsive potential curve. The effect of the external magnetic field on the photodissociation has been made clear, and the observed results could be fully explained on the basis of the adiabatic approximation.
Photodissociation of a molecule produces a spatial distribution of photofragments determined by the molecular structure and the characteristics of the dissociating light. Performing this basic reaction at ultracold temperatures allows its quantum mechanical features to dominate. In this regime, weak applied fields can be used to control the reaction. Here, we photodissociate ultracold diatomic strontium in magnetic fields below 10 G and observe striking changes in photofragment angular distributions. The observations are in excellent agreement with a multichannel quantum chemistry model that includes nonadiabatic effects and predicts strong mixing of partial waves in the photofragment energy continuum. The experiment is enabled by precise quantum-state control of the molecules.