Order-disorder phase transitions in tetrathioorthoesters of group IV elements X(SCH3)4, X = C, Si, Ge, Sn

Article Abstract:

Research was conducted to examine the order-disorder phase transitions in tetrathioorthoesters of group IV elements with the general formula X(SCH3)4, X = C, Si, Ge, Sn. Differential thermal analysis, X-ray diffraction and 1H NMR measurements were used for the experiments. Based on the thermodynamic data, previous literature values of vibrational spectroscopy and X-ray structure results, a model for the reorientation of C(SCH3)4 in the three solid phases is proposed.

Models, Phase transformations (Statistical physics), Phase transitions (Physics), Esters, Order-disorder models

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On the adequacy of mixed quantum-classical dynamics in condensed phase systems

Article Abstract:

This article discusses quantum mechanical and mixed quantum-classical approaches for studying vibrational energy relaxation function in condensed phase systems. Results indicate that vibronic absorption spectrum depends on both electronic transitions and vibrational relaxation.

United States, Statistical Data Included, Analysis, Testing, Condensed matter, Quantum chromodynamics, Relaxation phenomena, Relaxation (Physics), Vibrational spectra, Radiative transfer

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