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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

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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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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.
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...
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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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UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

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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 structure by adding the...
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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

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Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

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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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Two-dimensional vibrational-electronic spectroscopy.

Trevor L Courtney1, Zachary W Fox1, Karla M Slenkamp1

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

The Journal of Chemical Physics
|October 24, 2015
PubMed
Summary
This summary is machine-generated.

Two-dimensional vibrational-electronic (2D VE) spectroscopy reveals how vibrations influence charge transfer. This technique tracks energy transfer dynamics and vibrational couplings in molecular systems.

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Area of Science:

  • Physical Chemistry
  • Spectroscopy
  • Nonlinear Optics

Background:

  • Existing 2D spectroscopies are limited to either vibrational or electronic regions.
  • A technique linking vibrational and electronic spectra is needed to study coupled dynamics.
  • Vibrational-electronic couplings play a crucial role in energy and charge transfer processes.

Purpose of the Study:

  • To introduce and detail a new Two-Dimensional Vibrational-Electronic (2D VE) spectroscopy technique.
  • To probe vibrational-electronic couplings in molecules with charge transfer transitions.
  • To investigate vibrational energy transfer dynamics and correlations in molecular systems.

Main Methods:

  • Developed and implemented a femtosecond Fourier transform (FT) third-order nonlinear spectroscopy.
  • Utilized mid-infrared pump and optical probe fields resonant with vibrational and electronic transitions.
  • Applied 2D VE and 1D VE spectroscopy to metal-cyanide complexes in formamide.

Main Results:

  • 2D VE spectra revealed peaks from coupled vibrational modes and charge transfer transitions.
  • Observed coherent and incoherent vibrational energy transfer dynamics.
  • Demonstrated selective coupling of specific vibrational modes to metal-to-metal charge transfer.

Conclusions:

  • 2D VE spectroscopy directly measures vibrational-electronic dipole moment cross terms.
  • The technique provides insights into vibrational energy transfer and dynamics.
  • 2D VE spectroscopy is versatile for studying molecular, material, and biological systems.