Structure of N2-CH4 cryoalloys

Solodovnik, A. A.; Mysko-Krutik, N. S.; Bagatskii, M. I.

doi:10.1063/1.5012792

Cited by 3 publications

(1 citation statement)

References 15 publications

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“…The anisotropic EPR parameters of the matrix isolated rigid CH 3 radical are partially averaged by the radical fast libration motion . Based on the close van der Waals parameters for N 2 –N 2 and CH 4 –CH 4 interactions, and on the partial solubility of solid N 2 and CH 4 , one may expect that the EPR tensor anisotropies Δ A = A || – A ⊥ and Δ g = g || – g ⊥ for CH 3 in the rigid N 2 and CH 4 matrices are approximately equal. In the simulation, the static anisotropies were set the same as for CH 3 in N 2 : Δ A = 0.099 mT, Δ g = −3.7 × 10 –4 .…”

Section: Discussionmentioning

confidence: 99%

Quantum Impurity Rotator in a Matrix of Quantum Rotors: Electron Paramagnetic Resonance Dynamics of CH₃ in Solid CD₄ Matrix

Dmitriev

Benetis²

2018

J. Phys. Chem. A

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The rotational dynamics and the geometry of a light and flexible impurity molecule like methyl, matrix isolated in van der Waals solid, are supposed to be sensitive to the host molecule dynamics and order alterations of the matrix. In addition, the location of the impurity and its interaction with the matrix molecules is of prime importance. Large energy gaps between rotation levels of quantum rotators allow precise investigation of temperature-assisted quantum tunneling effects. The molecular rotation of methyl radicals isolated in the deuterated solid methane isotopomer, CD4, was investigated both by experimental and theoretical electron paramagnetic resonance (EPR) methods. The reduction of the quantum rotation frequency evident from the EPR spectrum of methyl radical at liquid-He temperatures was explained and connected to the irregular ratio of the central doublet to the outer quartet hf transitions. The involvement of temperature in the alteration of methyl symmetry between the C3 and D3 groups and the molecular host–host and guest–host interaction strengths were also examined by constructing temperature profiles of the rotation correlation times in the three phases of solid methane. The present study proves the deep impact that a van der Waals matrix may have on the geometry and the rotation levels of a substitutionally trapped quantum impurity rotor, effects that are yet very little known. This close correlation between dynamics of an impurity particle and the matrix molecules has great potential in developing sensitive physicochemical probes for van der Waals solids.

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Section: Discussionmentioning

confidence: 99%

Quantum Impurity Rotator in a Matrix of Quantum Rotors: Electron Paramagnetic Resonance Dynamics of CH₃ in Solid CD₄ Matrix

Dmitriev

Benetis²

2018

J. Phys. Chem. A

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Structure and properties of Ar–Kr solid solutions

Solodovnik

Mysko-Krutik

2019

Low Temperature Physics

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The transmission electron diffraction technique has been used to explore in detail solid argon-krypton solutions in a temperature range of 5–44 K. Specimens were prepared in situ by depositing the gaseous mixture on a base at temperatures 5 and 20 K. The structure of the Ar–Kr alloys was found to correspond to the face-centered cubic lattice in the entire range of reciprocal concentrations. In the concentration range of 50–70 mol % Ar, separation of the solution into two phases has been observed. The regions where solid argon-krypton solutions exist have been determined. Kinetics of relaxation processes stimulated by annealing the specimens has been studied. Conclusions regarding character of the Ar–Kr system state diagram have been made using the analysis of experimental data.

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Structural transformations in N2–Kr alloys

Solodovnik

Mysko-Krutik

2019

Low Temperature Physics

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The structural characteristics of N2–Kr alloys were studied using electron diffraction over the entire range of mutual concentrations. The samples were prepared in situ by condensing a gaseous mixture on aluminum and carbon substrates at temperatures of 5 and 20 K. The structure and solubility regions of the solutions were determined. The maximum solubility values of the components were: less than 20 mol.% for krypton in a nitrogen crystal, and less than 11 mol.%. for nitrogen in solid krypton. Phase separation of the solid solution was observed in a concentration range of 20–89 mol.% Kr. The effect of diluting the molecular matrix with krypton on the orientational ordering of N2 molecules in the solutions was investigated. An experimental dependence of the orientation order parameter on the solution composition was determined for N2-based solutions.

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Structure of N2-CH4 cryoalloys

Cited by 3 publications

References 15 publications

Quantum Impurity Rotator in a Matrix of Quantum Rotors: Electron Paramagnetic Resonance Dynamics of CH₃ in Solid CD₄ Matrix

Quantum Impurity Rotator in a Matrix of Quantum Rotors: Electron Paramagnetic Resonance Dynamics of CH₃ in Solid CD₄ Matrix

Structure and properties of Ar–Kr solid solutions

Structural transformations in N2–Kr alloys

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Structure of N2-CH4 cryoalloys

Cited by 3 publications

References 15 publications

Quantum Impurity Rotator in a Matrix of Quantum Rotors: Electron Paramagnetic Resonance Dynamics of CH3 in Solid CD4 Matrix

Quantum Impurity Rotator in a Matrix of Quantum Rotors: Electron Paramagnetic Resonance Dynamics of CH3 in Solid CD4 Matrix

Structure and properties of Ar–Kr solid solutions

Structural transformations in N2–Kr alloys

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Product

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Quantum Impurity Rotator in a Matrix of Quantum Rotors: Electron Paramagnetic Resonance Dynamics of CH₃ in Solid CD₄ Matrix

Quantum Impurity Rotator in a Matrix of Quantum Rotors: Electron Paramagnetic Resonance Dynamics of CH₃ in Solid CD₄ Matrix