scholarly journals Mapping the ultrafast vibrational dynamics of all-trans and 13-Cis retinal isomerization in Anabaena Sensory Rhodopsin

2019 ◽  
Vol 205 ◽  
pp. 10001
Author(s):  
Partha Pratim Roy ◽  
Rei Youshizumi ◽  
Hideki Kandori ◽  
Tiago Buckup
Keyword(s):  
Excited State ◽  
Frequency Shift ◽  
Vibrational Spectroscopy ◽  
Vibrational Modes ◽  
Sensory Rhodopsin ◽  
Vibrational Dynamics ◽  
State Evolution ◽  
Shift Dynamics

The ground and excited state evolution of fingerprint vibrational modes of all-trans-and 13-cis-retinal are mapped by impulsive vibrational spectroscopy. All-trans-retinal shows slower frequency shift dynamics in the excited state in comparison to 13-cis-retinal.

scholarly journals Effect of point mutations on the ultrafast photo-isomerization of Anabaena sensory rhodopsin

2018 ◽  
Vol 207 ◽  
pp. 55-75 ◽  
Author(s):  
D. Agathangelou ◽  
Y. Orozco-Gonzalez ◽  
M. del Carmen Marín ◽  
P. P. Roy ◽  
J. Brazard ◽  
...  
Keyword(s):  
Excited State ◽  
Point Mutations ◽  
Sensory Rhodopsin ◽  
Retinal Protein

Tuning excited state potentials and dynamics of a retinal protein through point mutations.

Low-frequency vibrational spectroscopy: a new tool for revealing crystalline magnetic structures in iron phosphate crystals

2021 ◽  
Vol 23 (39) ◽  
pp. 22241-22245
Author(s):  
Zihui Song ◽  
Xudong Liu ◽  
Anish Ochani ◽  
Suling Shen ◽  
Qiqi Li ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Long Range ◽  
Vibrational Spectroscopy ◽  
Strong Dependence ◽  
Low Frequency ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Promising Material ◽  
Vibrational Dynamics ◽  
Magnetic Structures

In this report, the strong-dependence of low-frequency (terahertz) vibrational dynamics on weak and long-range forces in crystals is leveraged to determine the bulk magnetic configuration of iron phosphate – a promising material for cathodes in lithium ion batteries.

scholarly journals Mapping the ultrafast vibrational dynamics of all-trans and 13-cis retinal isomerization in Anabaena Sensory Rhodopsin

2018 ◽  
Vol 20 (48) ◽  
pp. 30159-30173 ◽  
Author(s):  
Partha Pratim Roy ◽  
Youshitoka Kato ◽  
Rei Abe-Yoshizumi ◽  
Elisa Pieri ◽  
Nicolas Ferré ◽  
...  
Keyword(s):  
Sensory Rhodopsin ◽  
Vibrational Dynamics ◽  
Protein Cavity ◽  
Retinal Chromophore

Photoinduced vibrational dynamics between two stereoisomers of the retinal chromophore bound inside the same protein cavity has been explored.

scholarly journals Damage-free vibrational spectroscopy of biological materials in the electron microscope

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
Peter Rez ◽  
Toshihiro Aoki ◽  
Katia March ◽  
Dvir Gur ◽  
Ondrej L. Krivanek ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Radiation Damage ◽  
Vibrational Spectroscopy ◽  
Biological Materials ◽  
High Energy ◽  
Vibrational Modes ◽  
Native State ◽  
Organic Functional Groups ◽  
Electron Energy Loss ◽  
Electron Energy Loss Spectra

Abstract Vibrational spectroscopy in the electron microscope would be transformative in the study of biological samples, provided that radiation damage could be prevented. However, electron beams typically create high-energy excitations that severely accelerate sample degradation. Here this major difficulty is overcome using an ‘aloof’ electron beam, positioned tens of nanometres away from the sample: high-energy excitations are suppressed, while vibrational modes of energies <1 eV can be ‘safely’ investigated. To demonstrate the potential of aloof spectroscopy, we record electron energy loss spectra from biogenic guanine crystals in their native state, resolving their characteristic C–H, N–H and C=O vibrational signatures with no observable radiation damage. The technique opens up the possibility of non-damaging compositional analyses of organic functional groups, including non-crystalline biological materials, at a spatial resolution of ∼10 nm, simultaneously combined with imaging in the electron microscope.

Nuclear Reaction Spectroscopy of Vibrational Modes of Solids

1986 ◽  
Vol 82 ◽  
Author(s):  
M. Zinke-Allmang ◽  
S. Kalbitzer ◽  
M. Weiser
Keyword(s):  
Elastic Scattering ◽  
Nuclear Reaction ◽  
Vibrational Spectroscopy ◽  
Process Parameters ◽  
Target Atom ◽  
Vibrational Modes ◽  
Doppler Broadening ◽  
Vibrational States ◽  
Specific Process ◽  
Theoretical Predictions

ABSTRACTThe effects of target-atom vibrations on nuclear reaction kinetics have been examined. In particular, Doppler broadening of resonance-type and elastic- scattering reactions has been considered in detail. Depending on the specific process parameters, the resulting energy widths can be many orders of magnitude larger than the energies of the vibrational states of the target solid. Comparison of experimental results on a hydrogen-bearing thin target with the theoretical predictions shows excellent agreement. We will show the importance of this effect in hydrogen profiling measurements and point out the feasibility of vibrational spectroscopy on hydrogen in solids.

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