Ionization induced dynamic alignment of water

Two-body dissociation resulting from strong-field double ionization of water is investigated. Two distinct features are seen in the alignment of the fragment momenta with respect to the laser polarization. One feature shows alignment of the H–OH axis with the laser polarization, while the other indi...

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Bibliographic Details
Published in:The Journal of chemical physics 2020-04, Vol.152 (13), p.134308-134308
Main Authors: McCracken, Gregory A., Bucksbaum, Philip H.
Format: Article
Language:English
Subjects:
Alignment
Dependence
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Ionization
Polarization
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Summary:Two-body dissociation resulting from strong-field double ionization of water is investigated. Two distinct features are seen in the alignment of the fragment momenta with respect to the laser polarization. One feature shows alignment of the H–OH axis with the laser polarization, while the other indicates polarization alignment normal to the H–OH axis. By analyzing kinematic differences between the OH+/D+ and OD+/H+ channels of HOD, these two alignment features are shown to result from dissociation from different states in the dication. Only dissociation from one of these states has an alignment dependence consistent with predictions of sequential strong-field tunneling ionization models. The alignment dependence of dissociation from the other state can only be explained by dynamic alignment launched by the unbending of the molecule during ionization.
ISSN:0021-9606
1089-7690
DOI:10.1063/5.0002877