Zobrazeno 1 - 9
of 9
pro vyhledávání: '"Joachim, Beerwerth"'
Autor:
Joachim Beerwerth, Roland Böhmer
Publikováno v:
Journal of Non-Crystalline Solids: X, Vol 18, Iss , Pp 100180- (2023)
Ortho-carborane condenses into a plastically crystalline state in which the icosahedrally shaped molecules perform various kinds of motion. Using 11B nuclear magnetic resonance (NMR), the molecular motions and the phase transitions occurring in solid
Externí odkaz:
https://doaj.org/article/a5946826bf03445b829ca4e636bece6a
Autor:
Lars Hoffmann, Joachim Beerwerth, Mischa Adjei-Körner, Violeta Fuentes-Landete, Christina M. Tonauer, Thomas Loerting, Roland Böhmer
Publikováno v:
The Journal of chemical physics. 156(8)
Using oxygen-17 as a nuclear probe, spin relaxometry was applied to study the high-density and low-density states of amorphous ice, covering temperatures below and somewhat above their glass transitions. These findings are put in perspective with res
Publikováno v:
The Journal of Physical Chemistry C. 124:16202-16208
Oxygen-17 spin relaxation and stimulated-echo experiments are carried out to study temperature-dependent reorientational time scales in potassium permanganate. From an analysis of the present data, an energy barrier of 0.35 eV is found. This activati
Autor:
Joachim Beerwerth, L. S. Plaga, Jürgen Senker, Renée Siegel, Beate Bojer, Lars Hoffmann, Roland Böhmer, Wolf Hiller, M. Storek
Publikováno v:
Applied Magnetic Resonance. 51:597-620
Increasing dynamics in solids featuring nuclei subjected to second-order quadrupolar interactions lead to central-transition spectra that undergo two consecutive line-shaped transitions. Conventional motional narrowing occurs when the molecular excha
Autor:
Lars, Hoffmann, Joachim, Beerwerth, Dominik, Greim, Jürgen, Senker, Christian, Sternemann, Wolf, Hiller, Roland, Böhmer
Publikováno v:
The Journal of chemical physics. 152(3)
In this work, trimethoxyboroxine (TMB) is identified as a small-molecule glass former. In its viscous liquid as well as glassy states, static and dynamic properties of TMB are explored using various techniques. It is found that, on average, the struc
Autor:
M. Storek, Wolf Hiller, Dominik Greim, J. Lueg, B. Cetinkaya, Herbert Zimmermann, Roland Böhmer, Joachim Beerwerth, Renée Siegel, Jürgen Senker
Publikováno v:
Journal of Magnetic Resonance
Polycrystalline dimethyl sulfone is studied using central-transition oxygen-17 exchange NMR. The quadrupolar and chemical shift tensors are determined by combining quantum chemical calculations with line shape analyses of rigid-lattice spectra measur
Publikováno v:
The Journal of chemical physics. 150(19)
The microscopic and macroscopic dynamics of calcium alkali nitrate melts are studied in their supercooled regime by means of shear rheology and nuclear magnetic resonance (NMR). The structural relaxation is probed using shear rheology to access the v
Publikováno v:
Solid State Nuclear Magnetic Resonance. 71:96-107
Two-dimensional chemical exchange spectra are determined for powders containing half-integer quadrupolar nuclei that evolve under the second-order quadrupolar interaction. For simple exchange processes it is shown that the calculated exchange pattern
Publikováno v:
The Journal of chemical physics. 143(21)
Oxygen-17 stimulated-echo spectroscopy is a novel nuclear magnetic resonance (NMR) technique that allows one to investigate the time scale and geometry of ultraslow molecular motions in materials containing oxygen. The method is based on detecting or