scholarly journals Investigating the low-frequency vibrations of chlorophyll derivatives using terahertz spectroscopy

2021 ◽  
Author(s):  
Dominique Coquillat ◽  
Emma O'Connor ◽  
Etienne V. Brouillet ◽  
Yoann Meriguet ◽  
Cedric Bray ◽  
...  
Keyword(s):  
Terahertz Spectroscopy ◽  
Low Frequency ◽  
Chlorophyll Derivatives

scholarly journals Thermoelasticity in Organic Semiconductors Determined with Terahertz Spectroscopy and Quantum Quasi-Harmonic Simulations

2020 ◽  
Author(s):  
Peter A. Banks ◽  
Jefferson Maul ◽  
Mark T. Mancini ◽  
Adam C. Whalley ◽  
Alessandro Erba ◽  
...  
Keyword(s):  
Flexible Electronics ◽  
Density Functional ◽  
Mechanical Response ◽  
Terahertz Spectroscopy ◽  
Harmonic Approximation ◽  
Low Frequency ◽  
Intermolecular Forces ◽  
State Density ◽  
Experimental Apparatus ◽  
Thermoelastic Response

The thermomechanical response of organic semiconducting solids is an essential aspect to consider in the design of materials for advanced applications, and in particular, flexible electronics. The non-covalent intermolecular forces that exist in organic solids not only result in a diverse set of mechanical properties, but also a critical dependence of those same properties on temperature. However, studying the thermoelastic response of solids is experimentally challenging, often requiring large single-crystals and sensitive experimental apparatus. An alternative contactless approach involves using low-frequency vibrational spectroscopy to characterize the underlying intermolecular forces, and then combining this information with solid-state density functional theory simulations to retrieve the mechanical response of materials. This methodology leverages recent advances in the quasi-harmonic approximation to predict the temperature evolution of crystalline structures, dynamics, and associated forces, and then utilizes this information to determine the elastic tensor as a function of temperature. Here, this methodology is illustrated for two prototypical organic semiconducting crystals, rubrene and BTBT, and suggests a new alternative means to characterizing the thermoelastic response of organic materials.

scholarly journals Time-Resolved Terahertz Spectroscopy of Condensed Phase Reactions

1999 ◽  
Vol 19 (1-4) ◽  
pp. 145-148
Author(s):  
Richard McElroy ◽  
Klaas Wynne
Keyword(s):  
Terahertz Spectroscopy ◽  
Low Frequency ◽  
Electronic States ◽  
Carrier Dynamics ◽  
Solvation Dynamics ◽  
Vibrational Modes ◽  
Time Resolved ◽  
Condensed Phase Reactions ◽  
Probe Spectroscopy ◽  
First Time

Ultrafast time-resolved visible-pump, far-IR (THz) probe spectroscopy has been developed in our lab and has been applied to study carrier dynamics in photoexcited GaAs and dipole solvation dynamics in betaine and p-nitroaniline. This type of spectroscopy enables us to study for the first time the nonequilibrium interaction between excited electronic states and low frequency vibrational modes.

Ultrafast carrier dynamics in BiVO4 thin film photoanode material: interplay between free carriers, trapped carriers and low-frequency lattice vibrations

2016 ◽  
Vol 4 (47) ◽  
pp. 18516-18523 ◽  
Author(s):  
K. T. Butler ◽  
B. J. Dringoli ◽  
L. Zhou ◽  
P. M. Rao ◽  
A. Walsh ◽  
...  
Keyword(s):  
First Principles ◽  
Terahertz Spectroscopy ◽  
Low Frequency ◽  
Carrier Dynamics ◽  
Vibrational Modes ◽  
Lattice Vibrations ◽  
Time Resolved ◽  
Ultrafast Carrier Dynamics ◽  
Free Carriers ◽  
Ultrafast Carrier

We explore ultrafast carrier dynamics and interactions of photoexcited carriers with lattice vibrational modes in BiVO4 using time-resolved terahertz spectroscopy and first-principles phonon spectrum calculations.

Effects of multivalent hexacyanoferrates and their ion pairs on water molecule dynamics measured with terahertz spectroscopy

2017 ◽  
Vol 19 (10) ◽  
pp. 7297-7306 ◽  
Author(s):  
Matthew J. DiTucci ◽  
Fabian Böhm ◽  
Gerhard Schwaab ◽  
Evan R. Williams ◽  
Martina Havenith
Keyword(s):  
Fourier Transform ◽  
Water Molecule ◽  
Terahertz Spectroscopy ◽  
Ion Pairs ◽  
Low Frequency ◽  
Solvation Shell ◽  
Water Molecules ◽  
Molecule Dynamics

Broadband Fourier transform terahertz spectroscopy reveals that dynamical perturbations to the low-frequency dynamics of water molecules by multivalent hexacyanoferrate salts extend beyond the primary solvation shell.

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