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Related Concept Videos

UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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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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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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UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

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Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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Related Experiment Video

Updated: Mar 25, 2026

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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Time-resolved four-wave-mixing spectroscopy for inner-valence transitions.

Thomas Ding, Christian Ott, Andreas Kaldun

    Optics Letters
    |February 13, 2016
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed time-resolved four-wave-mixing spectroscopy using extreme ultraviolet pulses to observe electronic couplings in neon. This new method reveals inner-valence excited state dynamics, paving the way for molecular site-specific studies.

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    Area of Science:

    • Quantum optics
    • Atomic and molecular physics
    • Ultrafast spectroscopy

    Background:

    • Noncollinear four-wave-mixing (FWM) is established for mapping molecular couplings.
    • Correlations in extreme ultraviolet (XUV) inner-valence transitions remain unobserved.
    • Femtosecond and attosecond pulse techniques offer new spectroscopic possibilities.

    Purpose of the Study:

    • To experimentally observe correlations between spatially localized inner-valence transitions in the XUV spectral range.
    • To develop and apply time-resolved FWM spectroscopy using XUV and near-infrared (NIR) pulses.
    • To investigate coupling dynamics between excited states in neon.

    Main Methods:

    • Time-resolved four-wave-mixing (FWM) spectroscopy.
    • Coherent excitation using time-coincident XUV and NIR pulses.
    • Probing dynamics with a third NIR pulse.
    • Two-dimensional spectral representation for analyzing coupling dynamics.

    Main Results:

    • Successfully revealed coupling dynamics between odd- and even-parity, inner-valence excited states of neon.
    • Experimental results show strong agreement with ab initio time-dependent R-matrix calculations.
    • Validated findings with few-level model simulations, confirming multielectron interaction descriptions.

    Conclusions:

    • Demonstrated a novel time-resolved FWM technique for probing XUV inner-valence electronic couplings.
    • Established a pathway for observing site-specific electronic processes in molecules.
    • Opened new avenues for studying complex electron correlation effects in atoms and molecules.