Radiation-induced transformations of isolated dimethyl ether molecules at cryogenic temperatures: a FTIR matrix isolation study

Sulaev, V.S.; Shiryaeva, E.S.; Tyurin, D.A.; Feldman, V.I.

Авторы: Sulaev Vladimir S., Shiryaeva Ekaterina S., Tyurin Daniil A., Feldman Vladimir I.
Журнал: Radiation Physics and Chemistry
Том: 241
Год издания: 2026
Издательство: Elsevier
Местоположение издательства: United States
Номер статьи: 113557
DOI: 10.1016/j.radphyschem.2025.113557
Аннотация: Dimethyl ether (DME, CH3OCH3) is one of the important astrochemically relevant molecules detected in various extraterrestrial environments. In order to get mechanistic understanding of the possible pathways of the radiation-induced evolution of DME in cold media, we have carried out a systematic study on the products of its transformation in solid noble gas matrices (Ne, Ar, Kr, and Xe) under the action of X-rays at 4.5 K using Fourier transform infrared (FTIR) spectroscopy. The formation of a variety of products corresponding to the C–H and C–O bond cleavage, and molecular backbone rearrangements was observed. The major primary reaction channels include dissociation of C–H bonds leading to the CH3O·CH2 radical and C–O bond cleavage resulting in methane and formaldehyde. Also, significant amounts of the products of deep fragmentation corresponding to the C–O bond rupture accompanied by the loss of several hydrogen atoms (formyl radical and carbon monoxide) were found. The latter species are observed even at very low degree of the DME decomposition (particularly, in neon and argon matrices), which implies involvement of the “hot” reaction channels presumably proceeding through formation of vibrationally excited (unrelaxed) species. Remarkably, the formation of the products containing C–C bond (ethanol, acetaldehyde, vinyl alcohol, ketene, ketenyl radical, and dicarbon monoxide) was also observed. A provisional scheme of radiolysis was suggested on the basis of analysis of product accumulation and matrix effects.
Добавил в систему: Ширяева Екатерина Сергеевна

	ИСТИНА	Войти в систему Регистрация
	ИСТИНА ЦЭМИ РАН
	Главная Поиск Статистика О проекте Помощь

ИСТИНА

ИСТИНА ЦЭМИ РАН

Radiation-induced transformations of isolated dimethyl ether molecules at cryogenic temperatures: a FTIR matrix isolation studyстатья

Прикрепленные файлы