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Related Concept Videos

IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to the...
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and the...

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Multimodal Nonlinear Hyperspectral Chemical Imaging Using Line-Scanning Vibrational Sum-Frequency Generation Microscopy
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Modeling, calculating, and analyzing multidimensional vibrational spectroscopies.

Yoshitaka Tanimura1, Akihito Ishizaki

  • 1Department of Chemistry, Graduate School of Science, Kyoto University Kitashirakawa, Sakyoku, Kyoto 606-8502, Japan. tanimura@kuchem.kyoto-u.ac.jp

Accounts of Chemical Research
|May 16, 2009
PubMed
Summary

Multidimensional vibrational spectroscopy reveals complex molecular dynamics. This study explores system-bath coupling effects using theoretical models to analyze spectral data and understand thermal processes.

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Published on: January 25, 2020

Area of Science:

  • Physical Chemistry
  • Spectroscopy
  • Theoretical Chemistry

Background:

  • Spectral line shapes in condensed phases encode information about microscopic dynamics, couplings, and solvent effects.
  • Multidimensional vibrational spectroscopies are powerful tools for dissecting complex chemical dynamics by measuring nonlinear response functions.
  • A theoretical understanding of these phenomena is crucial for interpreting experimental and simulation data.

Purpose of the Study:

  • To explore and describe the roles of system-bath coupling peculiarities in multidimensional spectra.
  • To present analytical expressions for weakly coupled multimode Brownian systems for data analysis.
  • To compare the coordinate space (oscillator) and energy state models for describing nonlinear optical responses, particularly concerning thermal processes and anharmonic couplings.

Main Methods:

  • Utilized nonlinear response functions and ultrashort pulses to monitor vibrational motions.
  • Employed the Brownian oscillator model with nonlinear system-bath interaction.
  • Applied the hierarchy formalism for precise calculation of multidimensional spectra for anharmonic systems.

Main Results:

  • Demonstrated the importance of system-bath coupling in shaping multidimensional spectra.
  • Provided simple analytical expressions for analyzing experimental and simulation results in weakly coupled systems.
  • Highlighted the breakdown of the energy state model when including thermal excitation and relaxation, favoring the oscillator model for its intuitive handling of these processes.

Conclusions:

  • The coordinate space system-bath approach, complemented by molecular dynamics simulations, offers a more realistic description of thermal processes.
  • Comparing 2D spectra from different models elucidates the roles of thermal processes and anharmonic couplings.
  • The hierarchy formalism enables accurate calculation of multidimensional spectra for complex vibrational systems.