Ultra-Fast-VUV Photoemission Study of UV Excited 2-Nitrophenol
The initial deactivation pathways of gaseous 2-nitrophenol excited at 268 nm were investigated by time-resolved photoelectron spectroscopy (TRPES) with femtosecond-VUV light, produced by a monochromatized high harmonic generation source. TRPES allowed us to obtain new, valuable experimental information about the ultrafast excited-state dynamics of 2-nitrophenol in the gas phase. In accord with recent ab initio on-the-fly nonadiabatic molecular dynamic simulations, our results validate the occurrence of an ultrafast intersystem crossing leading to an intermediate state that decays on a subpicosecond time scale with a branched mechanisms. Two decay pathways are experimentally observed. One probably involves proton transfer, leading to the most stable triplet aci-form of 2-nitrophenol; the second pathway may involve OH rotation. We propose that following intersystem crossing, an ultrafast fragmentation channel leading to OH or HONO loss could also be operative.
2019
2019-02-12 09:41:24
1033
Ultrafast photoemission, nitrophenol
r6
A.
Ciavardini
70
Marcello
Coreno
70
Carlo
Callegari
70
C.
Spezzani
70
Giovanni
De Ninno
70
Barbara
Ressel
70
Cesare
Grazioli
70
Monica
de Simone
70
Antti
KivimakĖi
70
Paolo
Miotti
70
Fabio
Frassetto
70
Luca
Poletto
70
Petra
Rudolf
70
Simona
Fornarini
70
Marco
Pezzella
70
Enrico
Bodo
70
Susanna
Piccirillo
70
COBISS_ID
3
5327611
DOI
15
10.1021/acs.jpca.8b10136
NUK URN
18
URN:SI:UNG:REP:IO4YWBQC
acs.jpca.8b10136.pdf
1896604
Predstavitvena datoteka
2019-02-12 09:42:09