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IR Spectroscopy: Molecular Vibration Overview01:24

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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.
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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...
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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given...
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Molecular Spectroscopy: Absorption and Emission01:14

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Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels.  Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
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IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

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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.
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Multimode two-dimensional vibronic spectroscopy. I. Orientational response and polarization-selectivity.

James D Gaynor1, Robert B Weakly1, Munira Khalil1

  • 1Department of Chemistry, University of Washington, P.O. Box 351700, Seattle, Washington 98195, USA.

The Journal of Chemical Physics
|July 9, 2021
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Summary

New spectroscopic methods, two-dimensional Electronic-Vibrational (2D EV) and Vibrational-Electronic (2D VE) spectroscopy, enable mapping of molecular vibrations and electronic states. These techniques precisely determine vibronic couplings and molecular orientations.

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Area of Science:

  • Physical Chemistry
  • Spectroscopy
  • Quantum Mechanics

Background:

  • Coherent multidimensional spectroscopy offers advanced molecular probing.
  • Two-dimensional Electronic-Vibrational (2D EV) and Vibrational-Electronic (2D VE) spectroscopies are emerging techniques.
  • These methods are sensitive to vibronic couplings, crucial for understanding molecular dynamics.

Purpose of the Study:

  • To develop orientational response functions for simulating polarization-selective 2D EV and 2D VE spectra.
  • To propose analytical methods for signal isolation and determining relative orientations of dipole moments.
  • To provide a guide for mapping coupled vibronic coordinates using these advanced spectroscopic techniques.

Main Methods:

  • Development of complete orientational response functions for a model system.
  • Simulation of polarization-selective 2D EV and 2D VE spectra.
  • Application of analytical methods to isolate signals and extract orientation information from spectral features.
  • Analysis of time-dependent peak amplitudes for time-domain signal isolation.

Main Results:

  • Successful simulation of polarization-selective 2D EV and 2D VE spectra for a model system.
  • Demonstration of analytical methods to isolate specific spectral signals.
  • Extraction of the relative orientation between vibrational and vibronic dipole moments.
  • Identification of time-dependent peak amplitudes as a tool for signal isolation.

Conclusions:

  • Polarization-selective 2D EV and 2D VE spectroscopies are powerful tools for characterizing vibronic couplings.
  • These techniques allow for the precise determination of molecular orientations and vibronic coordinate mapping.
  • The proposed analytical methods facilitate the interpretation of complex multidimensional spectra.