Direct imaging of curve-crossing dynamics in IBr by attosecond transient absorption spectroscopy
| dc.contributor.author | Kobayashi, Yuki | |
| dc.contributor.author | Chang, Kristina F. | |
| dc.contributor.author | Zeng, Tao | |
| dc.contributor.author | Neumark, Daniel M. | |
| dc.contributor.author | Leone, Stephen R. | |
| dc.date.accessioned | 2020-04-17T20:24:35Z | |
| dc.date.available | 2020-04-17T20:24:35Z | |
| dc.date.issued | 2019-07-05 | |
| dc.description.abstract | The 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.citation | Science (July 5, 2019): 79-83. | en_US |
| dc.identifier.uri | https://doi.org/10.1126/science.aax0076 | en_US |
| dc.identifier.uri | https://hdl.handle.net/10315/37193 | |
| dc.language.iso | en | en_US |
| dc.publisher | American Association for the Advancement of Science | en_US |
| dc.rights.article | https://science.sciencemag.org/content/365/6448/79 | en_US |
| dc.rights.journal | https://science.sciencemag.org/ | en_US |
| dc.rights.publisher | https://www.aaas.org/ | en_US |
| dc.title | Direct imaging of curve-crossing dynamics in IBr by attosecond transient absorption spectroscopy | en_US |
| dc.title.alternative | Direct mapping of curve-crossing dynamics in IBr by attosecond transient absorption spectroscopy | en_US |
| dc.type | Article | en_US |