UV-Induced Mechanism of Aliphatic Cleavage in the Interstellar Medium

In the interstellar medium (ISM), UV processing leads to significant chemical transformations in hydrocarbons. Aliphatic hydrocarbons such as alkanes, commonly formed in evolved stars, undergo dehydrogenation primarily through UV-induced photocleavage of C–C bonds rather than direct hydrogen elimination. This study combines experimental data and ab initio calculations to understand how UV absorption at the H-Lyα emission line (121.6 nm) initiates the transition of alkanes to excited Rydberg states, resulting in the formation of olefinic C=C bonds, crucial precursors to aromatic hydrocarbons. The findings highlight a potential bottom-up pathway for the synthesis of unsaturated and aromatic hydrocarbons in dark clouds of the ISM.

You can find the work published in:


Photocleavage of Aliphatic C–C Bonds in the Interstellar Medium, Guillermo Tajuelo-Castilla, Jesús I. Mendieta-Moreno, Mario Accolla, Jesús M. Sobrado, Sofia Canola, Pavel Jelínek, Gary J. Ellis, José Ángel Martín-Gago, and Gonzalo Santoro, Astrophys. J. 965 (2024) 184.

Comentarios cerrados.