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Anisotropic Saturation of the EPR Spectrum of an DCO Radical Stabilized in Solid CO at 4.2 K and Its Orientation Motion

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Abstract

Formyl radicals, DCO, were produced in solid CO matrix and studied by EPR using gas deposition technique on a cold substrate at 4.2 K. The radical electron spin-lattice relaxation was measured to be anisotropic. The anisotropy was found to originate from the anisotropic orientational motion of the radical with the most intensive librations performed around a z axis corresponding to the smallest moment of inertia of the molecule. It was shown that, in solid CO, the libration motion of small molecules is modeled by considering a particle rotating in the orientational potential box. A suggestion was substantiated about the complicated nature of the orientational motion of HCO in the solid CO matrix including the intensive librations and slow tunneling rotation of the molecule around the z axis.

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ACKNOWLEDGMENTS

The author is grateful to his colleague and co-author of many papers, Dr. N.P. Benetis, for the information about the inertia tensors of HCO and DCO molecules obtained by calculation by the B3LYP-Pople method.

Funding

This work was supported by ongoing institutional funding. No additional grants to carry out or direct this particular research were obtained.

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  1. Ioffe Institute, St. Petersburg, Russia

    Ya. A. Dmitriev

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Dmitriev, Y.A. Anisotropic Saturation of the EPR Spectrum of an DCO Radical Stabilized in Solid CO at 4.2 K and Its Orientation Motion. Opt. Spectrosc. 131, 88–94 (2023). https://doi.org/10.1134/S0030400X23040070

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