scholarly journals Ultrafast dynamics of hydrated excess protons in CH3CN:H2O mixtures

2019 ◽  
Vol 205 ◽  
pp. 09003
Author(s):  
Fabian Dahms ◽  
Achintya Kundu ◽  
Ehud Pines ◽  
Benjamin P. Fingerhut ◽  
Erik T. J. Nibbering ◽  
...  
Keyword(s):  
Ultrafast Dynamics ◽  
Vibrational Dynamics ◽  
Pump Probe ◽  
2D Ir ◽  
Proton Potential ◽  
Hydrated Proton

In a combined experimental and theoretical 2D-IR and pump-probe study we determine how ultrafast solvent motions govern the vibrational dynamics of the hydrated proton and the key role played by the underlying proton potential.

scholarly journals Relationship between protein structural fluctuations and rebinding dynamics in ferric haem nitrosyls

2011 ◽  
Vol 433 (3) ◽  
pp. 459-468 ◽  
Author(s):  
Neil T. Hunt ◽  
Gregory M. Greetham ◽  
Michael Towrie ◽  
Anthony W. Parker ◽  
Nicholas P. Tucker
Keyword(s):  
Vibrational Dynamics ◽  
Time Resolved ◽  
Pump Probe ◽  
2D Ir ◽  
Ligand Rebinding ◽  
Protein Pockets ◽  
Biological Functionality ◽  
The Relationship ◽  
Kinetics Of ◽  
Haem Proteins

The interaction of nitric oxide (NO) with haem proteins is widespread in biology. In the current paper, we present the first ultrafast 2D-IR (two-dimensional infrared) spectroscopic analysis of haem nitrosylation, which has been combined with time-resolved IR pump–probe studies to investigate the relationship between equilibrium vibrational dynamics of the haem environment and ligand rebinding behaviour following photolysis of NO from the Fe(III)–NO site. Studies of two haem proteins, Mb (myoglobin) and Cc (cytochrome c), which play different physiological roles, reveal marked contrasts in the ultrafast fluctuations of the protein pockets containing the haem, showing that the Mb pocket is somewhat more flexible than that of Cc. This correlates strongly with slower observed photolysis rebinding kinetics of Mb–NO compared with Cc–NO, and indicates a direct link between ultrafast fluctuations and biological functionality. Furthermore, this indicates the validity of linear response theories in relation to protein ligand binding. Finally, 2D-IR shows that Cc–NO displays two distinct structural sub-sites at room temperature that do not exchange on the timescales accessible via the NO vibrational lifetime.

scholarly journals Vibrational dynamics and solvatochromism of the label SCN in various solvents and hemoglobin by time dependent IR and 2D-IR spectroscopy

2014 ◽  
Vol 16 (36) ◽  
pp. 19643-19653 ◽  
Author(s):  
Luuk J. G. W. van Wilderen ◽  
Daniela Kern-Michler ◽  
Henrike M. Müller-Werkmeister ◽  
Jens Bredenbeck
Keyword(s):  
Hydrogen Bonding ◽  
Ir Spectroscopy ◽  
Structural Dynamics ◽  
Spectral Diffusion ◽  
Time Dependent ◽  
Vibrational Dynamics ◽  
2D Ir

The vibrational label SCN is used to report on local structural dynamics in a protein revealing spectral diffusion on a picosecond scale. The SCN spectra are compared to the response of methylthiocyanate in solvents with different polarity and hydrogen-bonding capabilities.

scholarly journals Dynamics of Primary Events in the Photocycle of Excited Bacteriorhodopsin

2004 ◽  
Vol 36 (11) ◽  
pp. 724-728 ◽  
Author(s):  
Jun-Jun Lu ◽  
Ming Ming ◽  
Yi Yang ◽  
Jia Wu ◽  
Bo Li ◽  
...  
Keyword(s):  
Dynamic Behavior ◽  
Time Scale ◽  
Excitation Wavelength ◽  
Ultrafast Dynamics ◽  
Medium Ph ◽  
Pump Probe ◽  
Dynamical Behaviors ◽  
Retinal Chromophore ◽  
Ph Dependent ◽  
The One

Abstract Transient dynamic behavior of the excited bacteriorhodopsin (BR), which was isolated from the strain H. salinarum, was studied at excitation wavelength from 585 to 639 nm. With the one-color femtosecond (fs) pump-probe technique, we revealed the primary events in BR's photocycle that took place in an ultrafast time scale. From the analysis of the decay components of the dynamical traces, it was evident that the isomerization of the retinal chromophore in BR and the intermediate J's formation occurred within 500 fs. BR exhibited pH-dependent dynamical behaviors. When the medium pH was between 5 and 9, the BR ultrafast dynamics has no obvious change. In contrast, the dynamical curves were obviously affected when the pH was out of that region.

Ultrafast dynamics in pentacene and tetracene probed using optical pump-probe spectroscopy

2004 ◽  
Author(s):  
Verner K. Thorsmølle ◽  
R D. Averitt ◽  
J Demsar ◽  
X Chi ◽  
S Tretiak ◽  
...  
Keyword(s):  
Ultrafast Dynamics ◽  
Optical Pump ◽  
Pump Probe ◽  
Probe Spectroscopy

scholarly journals Mapping and controlling ultrafast dynamics of highly excited H2 molecules by VUV-IR pump-probe schemes

2017 ◽  
Vol 95 (1) ◽  
Author(s):  
F. P. Sturm ◽  
X. M. Tong ◽  
A. Palacios ◽  
T. W. Wright ◽  
I. Zalyubovskaya ◽  
...  
Keyword(s):  
Ultrafast Dynamics ◽  
Pump Probe
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