Direct imaging of curve-crossing dynamics in IBr by attosecond transient absorption spectroscopy

dc.contributor.authorKobayashi, Yuki
dc.contributor.authorChang, Kristina F.
dc.contributor.authorZeng, Tao
dc.contributor.authorNeumark, Daniel M.
dc.contributor.authorLeone, Stephen R.
dc.date.accessioned2020-04-17T20:24:35Z
dc.date.available2020-04-17T20:24:35Z
dc.date.issued2019-07-05
dc.description.abstractThe electronic character of photoexcited molecules can abruptly change at avoided crossings and conical intersections. Here, we report direct spectroscopic imaging of such nonadiabatic processes in a prototype molecule, iodine monobromide (IBr), using extreme-ultraviolet (XUV) attosecond transient absorption spectroscopy. A few-femtosecond visible pulse resonantly excites the B(3Π0+ ) state and the accompanying dissociation dynamics are tracked by an attosecond XUV pulse that simultaneously probes the I-4d and Br-3d core-level ab- sorption edges. Direct comparison with quantum mechanical simulations unambiguously identifies the core-level absorption features associated with adiabatic and diabatic channels at the avoided crossing that is accessed by one-photon and two-photon visible-excitation processes. The results delineate rapid switching of valence-orbital vacancies from σ∗ to π/π∗ ensuing at the avoided crossing.en_US
dc.identifier.citationScience (July 5, 2019): 79-83.en_US
dc.identifier.urihttps://doi.org/10.1126/science.aax0076en_US
dc.identifier.urihttps://hdl.handle.net/10315/37193
dc.language.isoenen_US
dc.publisherAmerican Association for the Advancement of Scienceen_US
dc.rights.articlehttps://science.sciencemag.org/content/365/6448/79en_US
dc.rights.journalhttps://science.sciencemag.org/en_US
dc.rights.publisherhttps://www.aaas.org/en_US
dc.titleDirect imaging of curve-crossing dynamics in IBr by attosecond transient absorption spectroscopyen_US
dc.title.alternativeDirect mapping of curve-crossing dynamics in IBr by attosecond transient absorption spectroscopyen_US
dc.typeArticleen_US

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