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Photodissociation of water induced by a long UV pulse and probed by high-energy-resolution x-ray-absorption spectroscopy
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Theoretical Chemistry and Biology. Siberian Fed Univ, Int Res Cent Spect & Quantum Chem, Krasnoyarsk 660041, Russia..ORCID iD: 0000-0002-4792-9525
North China Elect Power Univ, Dept Math & Phys, Beijing 102206, Peoples R China..
Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, SE-10691 Stockholm, Sweden..ORCID iD: 0000-0002-7023-2486
Siberian Fed Univ, Int Res Cent Spect & Quantum Chem, Krasnoyarsk 660041, Russia..
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2021 (English)In: Physical Review A: covering atomic, molecular, and optical physics and quantum information, ISSN 2469-9926, E-ISSN 2469-9934, Vol. 104, no 3, article id 032816Article in journal (Refereed) Published
Abstract [en]

A UV-pump x-ray-probe (UVX-PP) experiment for probing UV initiated dissociation of the water molecule with long pulses is proposed on the basis of theoretical simulations. With long overlapping UV and x-ray pulses, we can obtain high-spectral-resolution x-ray-absorption or ionization spectra, containing detailed information about dynamics in the intermediate valence-excited state. The dynamics can be influenced with frequency detuning of the pump UV pulse, which acts as a camera shutter by regulating the duration of the UVX-PP process. Thereby, this UVX-PP setup gives access to ultrafast dynamics of the nuclear wave packet without experimentally challenging requirements of ultrashort pulses and controlled delay times. In a case study of the water molecule, we focus on the lowest UVX-PP channel (1b(1) -> 4a(1), 1a(1) -> 1b(1)) where both intermediate valence-excited and final core-excited states are dissociative. The variation of the UVX-PP duration, controlled by the UV detuning, and different dispersion laws of so-called molecular and atomic bands allow one to study the dynamics of fragmentation of the water molecule in the intermediate state. A feature is that the long lifetime of intermediate valence-excited states opens a door for studies of photoinduced dissociation of polyatomic molecules with heavy fragments.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2021. Vol. 104, no 3, article id 032816
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-302604DOI: 10.1103/PhysRevA.104.032816ISI: 000696016500006Scopus ID: 2-s2.0-85114859790OAI: oai:DiVA.org:kth-302604DiVA, id: diva2:1606534
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QC 20211027

Available from: 2021-10-27 Created: 2021-10-27 Last updated: 2024-03-18Bibliographically approved

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Savchenko, ViktoriiaOdelius, MichaelGel'mukhanov, FarisKimberg, Victor

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Atom and Molecular Physics and Optics

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