Vibrationally mediated photodissociation dynamics of pyrrole
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F19%3A00517109" target="_blank" >RIV/61388955:_____/19:00517109 - isvavai.cz</a>
Nalezeny alternativní kódy
RIV/00216208:11320/19:10414683
Výsledek na webu
<a href="http://hdl.handle.net/11104/0302391" target="_blank" >http://hdl.handle.net/11104/0302391</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1063/1.5091974" target="_blank" >10.1063/1.5091974</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Vibrationally mediated photodissociation dynamics of pyrrole
Popis výsledku v původním jazyce
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).
Název v anglickém jazyce
Vibrationally mediated photodissociation dynamics of pyrrole
Popis výsledku anglicky
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).
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
10403 - Physical chemistry
Návaznosti výsledku
Projekt
<a href="/cs/project/GA17-04068S" target="_blank" >GA17-04068S: Molekulové klastry jako nano-reaktory pro chemii řízenou fotony a elektrony</a><br>
Návaznosti
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Ostatní
Rok uplatnění
2019
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
AIP Advances
ISSN
2158-3226
e-ISSN
—
Svazek periodika
9
Číslo periodika v rámci svazku
3
Stát vydavatele periodika
US - Spojené státy americké
Počet stran výsledku
7
Strana od-do
035151
Kód UT WoS článku
000462880300099
EID výsledku v databázi Scopus
2-s2.0-85064668307