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Related Concept Videos

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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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Updated: May 6, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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Bleaching-corrected fluorescence microspectroscopy with nanometer peak position resolution.

Iztok Urbančič, Zoran Arsov, Ajasja Ljubetič

    Optics Express
    |October 24, 2013
    PubMed
    Summary
    This summary is machine-generated.

    Fluorescence microspectroscopy (FMS) can now analyze photosensitive dyes by using advanced spectral fitting and bleaching correction. This breakthrough expands the range of probes usable in FMS for studying molecular environments.

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    Area of Science:

    • Biophysics
    • Spectroscopy
    • Materials Science

    Background:

    • Fluorescence microspectroscopy (FMS) uses environmentally sensitive dyes to probe local molecular environments at high spatial resolution.
    • Previous FMS applications were limited to probes with large spectral shifts and high photostability, restricting dye selection.

    Purpose of the Study:

    • To develop and validate spectral fitting models and bleaching correction algorithms for FMS.
    • To enable the use of a wider range of fluorophores, including photosensitive ones, in microspectroscopy.

    Main Methods:

    • Systematic analysis of spectral fitting models and bleaching correction algorithms.
    • Stochastic wavelength sampling for data acquisition.
    • Analysis of spectral peak position resolution and bleaching rates.

    Main Results:

    • Developed methods allow nanometer spectral peak position resolution even for highly photosensitive fluorophores.
    • Demonstrated the exploitation of small spectral shifts and changes in bleaching rates.
    • Successfully analyzed vesicles in different lipid phases using the new methods.

    Conclusions:

    • Advanced data analysis techniques overcome limitations of photostability and spectral shift size in FMS.
    • A broader spectrum of dyes, previously confined to bulk spectrofluorimetry, can now be effectively utilized in FMS.
    • This expands the toolkit for high-resolution molecular environment analysis using FMS.