Počet záznamů: 1
Vibrationally mediated photodissociation dynamics of pyrrole
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SYSNO ASEP 0517109 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Vibrationally mediated photodissociation dynamics of pyrrole Tvůrce(i) Grygoryeva, Kateřina (UFCH-W)
Rakovský, Jozef (UFCH-W) RID, ORCID
Vinklarek, I. S. (CZ)
Votava, Ondřej (UFCH-W) RID, ORCID
Fárník, Michal (UFCH-W) RID, ORCID
Poterya, Viktoriya (UFCH-W) RID, ORCIDČíslo článku 035151 Zdroj.dok. AIP Advances. - : AIP Publishing
Roč. 9, č. 3 (2019)Poč.str. 7 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova near-ultraviolet photolysis ; wave-packet description ; excited-state ; atom elimination ; photochemistry ; spectroscopy Vědní obor RIV CF - Fyzikální chemie a teoretická chemie Obor OECD Physical chemistry CEP GA17-04068S GA ČR - Grantová agentura ČR Způsob publikování Open access Institucionální podpora UFCH-W - RVO:61388955 UT WOS 000462880300099 EID SCOPUS 85064668307 DOI 10.1063/1.5091974 Anotace We investigate photo dissociation of vibrationally excited pyrrole molecules in a velocity map imaging experiment with IR excitation of N-H bond stretching vibration v(1) = 1, nu(IR) = 3532 cm(-1), and UV photodissociation at lambda(UV) = 243 nm. In the IR+UV experiment, the H-fragment signal is enhanced with respect to the 243 nm UV-only photodissociation due to a more favorable Franck-Condon factor for the vibrationally excited molecule. In the measured H-fragment kinetic energy distribution, the maximum of the fast peak in the IR+UV experiment is shifted by 0.23 eV compared to the UV-only photodissociation which corresponds to 53 % of the vibrational energy deposited into the fragment kinetic energy. We compare our results with an isoenergetic UV-only photodissociation at lambda(UV) = 224 nm. About 72 % of the total available energy, is released into the fragment kinetic energy in the IR+UV experiment, while it is only 61 % in the UV-only photodissociation. This can be substantiated by the coupling of the N-H bond stretching vibration into the kinetic energy of the departing H-fragment. We also probe the time-dependent dynamics by a nanosecond pump-probe experiment. The IR excitation enhances the N-H bond dissociation even when the UV photodissociation is delayed by 150 ns. This enhancement increases also the yield of the fast fragments at the position of the peak corresponding to the IR+UV excitation, i.e. even 150 ns after the IR vibrational excitation, the same amount of the IR excitation energy can be converted into the H-fragment velocity as immediately after the excitation. (C) 2019 Author(s). Pracoviště Ústav fyzikální chemie J.Heyrovského Kontakt Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Rok sběru 2020 Elektronická adresa http://hdl.handle.net/11104/0302391
Počet záznamů: 1