International Physics Conference.St. Petersburg, October 21-25, 2024, St. Petersburg
Spectroscopy and physics of atoms and molecules

EPR spectroscopy of CH$_3$ rotational states for the radicals trapped in solid CH$_4$ at liquid helium temperatures

Yu. A. Dmitriev

Ioffe Institute, St. Petersburg, Russia

Abstract: Methyl radicals, CH$_3$, are vapor deposited in solid CH$_4$ on a substrate at $T_{dep}$ = 4.2 K. EPR spectra of the radicals are taken in the temperature range $T_{rec}$ = 1.4 – 4.2 K. The spectra processing, including intensity measurement of the forbidden electron-proton transitions and line shape analysis of the allowed transitions, reveals correlation of the orientational motions of the trapped radical and the nearest matrix molecules.

Keywords: electron paramagnetic resonance, matrix isolation, methyl radical, solid methane, molecular rotation.

Received: 26.04.2024
Revised: 01.08.2024
Accepted: 30.10.2024

DOI: 10.61011/OS.2024.11.59491.6359-24

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