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Orientation Dynamics of the Methyl Radical and Matrix Molecules in Solid Methane, CH4, and CD4 at Cryogenic Temperatures
Ist Teil von
Optics and spectroscopy, 2021-11, Vol.129 (11), p.1219-1225
Ort / Verlag
Moscow: Pleiades Publishing
Erscheinungsjahr
2021
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The temperature dependences of the relative populations of the rotational levels of the methyl radical CH
3
in
A
- and
E
-symmetric states for the radicals stabilized in solid methane CH
4
in the temperature range 1.4–4.2 K and in solid CO in the range 6–33 K were determined by the method of electron paramagnetic resonance. The features of the orientation movement of radicals at cryogenic temperatures have been determined. The analysis performed has shown that the partial orientation of near-order molecules is preserved in solid methane CH
4
and CD
4
even in the orientationally disordered phase and a correlated reorientation of molecules occurs in low-temperature phases with total or partial orientation ordering.