Autoionization from the plasmon resonance in isolated 1-cyanonaphthalene.

Autor:	Bull JN; School of Chemistry, Norwich Research Park, University of East Anglia, Norwich NR4 7TJ, United Kingdom.; Centre for Photonics and Quantum Science, University of East Anglia, Norwich NR4 7TJ, United Kingdom., Bolognesi P; CNR-Istituto di Struttura della Materia, Area della Ricerca di Roma 1, Rome, Italy., Anstöter CS; Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom., Ashworth EK; School of Chemistry, Norwich Research Park, University of East Anglia, Norwich NR4 7TJ, United Kingdom., Navarro Navarrete JE; Department of Physics, Stockholm University, SE-10691 Stockholm, Sweden., Zhu B; Department of Physics, Stockholm University, SE-10691 Stockholm, Sweden., Richter R; Elettra Sincrotrone Trieste, Trieste, Italy., Pal N; Elettra Sincrotrone Trieste, Trieste, Italy., Chiarinelli J; CNR-Istituto di Struttura della Materia, Area della Ricerca di Roma 1, Rome, Italy., Avaldi L; CNR-Istituto di Struttura della Materia, Area della Ricerca di Roma 1, Rome, Italy., Zettergren H; Department of Physics, Stockholm University, SE-10691 Stockholm, Sweden., Stockett MH; Department of Physics, Stockholm University, SE-10691 Stockholm, Sweden.
Jazyk:	angličtina
Zdroj:	The Journal of chemical physics [J Chem Phys] 2023 Jun 28; Vol. 158 (24).
DOI:	10.1063/5.0153058
Abstrakt:	Polycyclic aromatic hydrocarbons have widely been conjectured to be ubiquitous in space, as supported by the recent discovery of two isomers of cyanonaphthalene, indene, and 2-cyanoindene in the Taurus molecular cloud-1 using radioastronomy. Here, the photoionization dynamics of 1-cyanonaphthalene (1-CNN) are investigated using synchrotron radiation over the hν = 9.0-19.5 eV range, revealing that prompt autoionization from the plasmon resonance dominates the photophysics for hν = 11.5-16.0 eV. Minimal photo-induced dissociation, whether originating from an excited state impulsive bond rupture or through internal conversion followed by a statistical bond cleavage process, occurs over the microsecond timescale (as limited by the experimental setup). The direct photoionization cross section and photoelectron angular distributions are simulated using an ezDyson model combining Dyson orbitals with Coulomb wave photoejection. When considering these data in conjunction with recent radiative cooling measurements on 1-CNN+, which showed that cations formed with up to 5 eV of internal energy efficiently stabilize through recurrent fluorescence, we conclude that the organic backbone of 1-CNN is resilient to photodestruction by VUV and soft XUV radiation. These dynamics may prove to be a common feature for the survival of small polycyclic aromatic hydrocarbons in space, provided that the cations have a suitable electronic structure to support recurrent fluorescence. (© 2023 Author(s). Published under an exclusive license by AIP Publishing.)
Databáze:	MEDLINE
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