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Efficient stabilization of cyanonaphthalene by fast radiative cooling and implications for the resilience of small PAHs in interstellar clouds

Space Sciences

Efficient stabilization of cyanonaphthalene by fast radiative cooling and implications for the resilience of small PAHs in interstellar clouds

M. H. Stockett, J. N. Bull, et al.

This groundbreaking research by Mark H. Stockett and colleagues reveals that the abundance of cyanonaphthalene in the Taurus Molecular Cloud far exceeds expectations, challenging existing astrophysical models. The study uncovers critical insights into the stability of 1-CNN⁺ and its implications for the understanding of small PAH destruction in space.

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Playback language: English
Abstract
The observed abundance of cyanonaphthalene (CNN) in the Taurus Molecular Cloud (TMC-1) is six orders of magnitude higher than expected from astrophysical modeling. This study reports unimolecular dissociation and radiative cooling rate coefficients of 1-CNN isomer in its cationic form. Recurrent Fluorescence (RF) efficiently stabilizes 1-CNN⁺ due to enhanced electronic transition probability by vibronic coupling. These findings help explain the anomalous abundance of CNN in TMC-1 and challenge the assumption of rapid destruction of small PAHs in space.
Publisher
Nature Communications
Published On
Jan 24, 2023
Authors
Mark H. Stockett, James N. Bull, Henrik Cederquist, Suvasthika Indrajith, MingChao Ji, José E. Navarro Navarrete, Henning T. Schmidt, Henning Zettergren, Boxing Zhu
Tags
cyanonaphthalene
Taurus Molecular Cloud
unimolecular dissociation
radiative cooling
PAH destruction

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