Issue 34, 2024

Electronic energy transfer ionization in naphthalene–CO2 clusters reveals excited states of dry ice

Abstract

Electronic energy relaxation and transfer shapes the photochemistry in molecules and materials that are exposed to UV radiation in areas ranging from astrochemistry to biology. The interaction between CO2 and polycyclic aromatic hydrocarbons (PAHs) specifically, is of paramount interest in astrochemically relevant ices, the transition to renewable energy and the development of green chemistry. We investigate the vacuum UV excitation of the naphthalene–CO2 complex and observe excited states of CO2 through a newly identified molecular electronic energy transfer ionization mechanism. We evaluate the spectral development upon cluster growth with time-dependent density functional theory and show that the photoionization spectrum of naphthalene–CO2 closely resembles the photon-stimulated desorption spectrum of CO2 ice. The molecular electronic energy transfer ionization mechanism may affect the energy redistribution and charge balance in the interstellar medium significantly and therefore we discuss its implications for astrochemical models.

Graphical abstract: Electronic energy transfer ionization in naphthalene–CO2 clusters reveals excited states of dry ice

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Article information

Article type
Edge Article
Submitted
30 may 2024
Accepted
17 iyl 2024
First published
31 iyl 2024
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2024,15, 13631-13637

Electronic energy transfer ionization in naphthalene–CO2 clusters reveals excited states of dry ice

A. K. Lemmens, A. Wannenmacher, N. Dias and M. Ahmed, Chem. Sci., 2024, 15, 13631 DOI: 10.1039/D4SC03561E

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