Stroboscopic time-resolved SANS technique for dynamical studies of slow relaxation processes

2006 ◽  
Vol 385-386 ◽  
pp. 1183-1186 ◽  
Author(s):  
U. Keiderling ◽  
A. Wiedenmann ◽  
J. Haug
Keyword(s):  
Slow Relaxation ◽  
Relaxation Processes ◽  
Time Resolved

Magnetic field and dilution effects on the slow relaxation of {Er3} triangle-based arsenotungstate single-molecule magnets

2020 ◽  
Vol 49 (35) ◽  
pp. 12458-12465 ◽  
Author(s):  
Hanhan Chen ◽  
Lin Sun ◽  
Jinpeng Zhang ◽  
Zikang Xiao ◽  
Pengtao Ma ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Single Molecule ◽  
Magnetic Relaxation ◽  
Slow Relaxation ◽  
Relaxation Processes ◽  
Single Molecule Magnets ◽  
Thermally Activated ◽  
Slow Magnetic Relaxation ◽  
Dilution Effects

Triangular {Er3} cluster containing POM exhibits field-induced two thermally activated relaxation processes. Whereas, the diamagnetic dilution sample indicates slow magnetic relaxation with the QTM being partially suppressed.

Slow relaxation processes and screening in ferroelectric-semiconductor SBSI

1984 ◽  
Vol 61 (1) ◽  
pp. 299-314 ◽  
Author(s):  
V. M. Fridkin ◽  
A. A. Grekov ◽  
N. A. Korchagina ◽  
E. D. Rogach ◽  
A. I. Rodin ◽  
...  
Keyword(s):  
Slow Relaxation ◽  
Relaxation Processes

Dynamical Response of the Electric Double Layer Structure of the DEME-TFSI Ionic Liquid to Potential Changes Observed by Time-Resolved X-ray Reflectivity

2016 ◽  
Vol 230 (4) ◽  
Author(s):  
Wolfgang Voegeli ◽  
Etsuo Arakawa ◽  
Tadashi Matsushita ◽  
Osami Sakata ◽  
Yusuke Wakabayashi
Keyword(s):  
Ionic Liquid ◽  
Double Layer ◽  
Time Scale ◽  
Electric Double Layer ◽  
Structural Changes ◽  
Layer Structure ◽  
Dynamical Response ◽  
Relaxation Processes ◽  
Time Resolved ◽  
X Ray

AbstractThe interface between the N,N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium bis(trifluoromethanesulfonyl)imide (DEME-TFSI) ionic liquid and a gold (111) surface was investigated with time-resolved X-ray reflectivity in order to clarify the dynamics of structural changes of the electric double layer after changing the electrode potential. In the experiment, the potential was switched repeatedly between +1.5 V and −1.5 V every 2 s or every 0.3 s, while measuring the specular X-ray reflectivity. When the potential was switched every 2 s, the time dependence of the reflectivity was different from that of the accumulated charge. This indicates structural relaxation processes that occur on a slower time scale than the acummulation of the charge at the electric double layer.When the potential was switched every 0.3 s, on the other hand, the reflectivity changes followed the evolution of the charge of the electric double layer within the experimental precision, indicating that slow relaxation processes without charge transfer do not contribute significantly to structural changes at this time scale.

scholarly journals Time-resolved luminescence spectroscopy by the optical Kerr-gate method applicable to ultrafast relaxation processes

2000 ◽  
Vol 62 (15) ◽  
pp. 10083-10087 ◽  
Author(s):  
J. Takeda ◽  
K. Nakajima ◽  
S. Kurita ◽  
S. Tomimoto ◽  
S. Saito ◽  
...  
Keyword(s):  
Luminescence Spectroscopy ◽  
Relaxation Processes ◽  
Time Resolved ◽  
Ultrafast Relaxation ◽  
Optical Kerr Gate

scholarly journals Susceptibility functions for slow relaxation processes in supercooled liquids and the search for universal relaxation patterns

2003 ◽  
Vol 118 (16) ◽  
pp. 7544 ◽  
Author(s):  
Th. Blochowicz ◽  
Ch. Tschirwitz ◽  
St. Benkhof ◽  
E. A. Rössler
Keyword(s):  
Supercooled Liquids ◽  
Slow Relaxation ◽  
Relaxation Processes

scholarly journals Temperature-Jump Solution X-ray Scattering Reveals Distinct Motions in a Dynamic Enzyme

2018 ◽  
Author(s):  
Michael C. Thompson ◽  
Benjamin A. Barad ◽  
Alexander M. Wolff ◽  
Hyun Sun Cho ◽  
Friedrich Schotte ◽  
...  
Keyword(s):  
Protein Dynamics ◽  
Conformational Changes ◽  
Thermal Excitation ◽  
Relaxation Processes ◽  
Spectroscopic Techniques ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering ◽  
Solvent Molecules ◽  
Ray Scattering

AbstractCorrelated motions of proteins and their bound solvent molecules are critical to function, but these features are difficult to resolve using traditional structure determination techniques. Time-resolved methods hold promise for addressing this challenge but have relied on the exploitation of exotic protein photoactivity, and are therefore not generalizable. Temperature-jumps (T-jumps), through thermal excitation of the solvent, have been implemented to study protein dynamics using spectroscopic techniques, but their implementation in X-ray scattering experiments has been limited. Here, we perform T-jump small- and wide-angle X-ray scattering (SAXS/WAXS) measurements on a dynamic enzyme, cyclophilin A (CypA), demonstrating that these experiments are able to capture functional intramolecular protein dynamics. We show that CypA displays rich dynamics following a T-jump, and use the resulting time-resolved signal to assess the kinetics of conformational changes in the enzyme. Two relaxation processes are resolved, which can be characterized by Arrhenius behavior. We also used mutations that have distinct functional effects to disentangle the relationship of the observed relaxation processes. A fast process is related to surface loop motions important for substrate specificity, whereas a slower process is related to motions in the core of the protein that are critical for catalytic turnover. These results demonstrate the power of time-resolved X-ray scattering experiments for characterizing protein and solvent dynamics on the μs-ms timescale. We expect the T-jump methodology presented here will be useful for understanding kinetic correlations between local conformational changes of proteins and their bound solvent molecules, which are poorly explained by the results of traditional, static measurements of molecular structure.

Modulating single-molecule magnet behavior towards multiple magnetic relaxation processes through structural variation in Dy4 clusters

2018 ◽  
Vol 5 (8) ◽  
pp. 1876-1885 ◽  
Author(s):  
Wen-Min Wang ◽  
Xiao-Min Kang ◽  
Hai-Yun Shen ◽  
Zhi-Lei Wu ◽  
Hong-Ling Gao ◽  
...  
Keyword(s):  
Schiff Base ◽  
Single Molecule ◽  
Schiff Base Ligand ◽  
Magnetic Relaxation ◽  
Structural Variation ◽  
Slow Relaxation ◽  
Relaxation Processes ◽  
Magnetic Studies ◽  
Single Molecule Magnet

Three Dy4 clusters based on a flexible and attractive Schiff base ligand HL have been synthesized, and they showed different tetranuclear core arrangements. Magnetic studies reveal that clusters 1–3 display distinct slow relaxation of magnetization.

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