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Related Concept Videos

Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.
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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Polarization sensitive ultrafast mid-IR pump probe micro-spectrometer with diffraction limited spatial resolution.

M Kaucikas1, J Barber, J J Van Thor

  • 1Division of Molecular Biosciences, Imperial College London, South Kensington Campus, SW7 2AZ, UK.

Optics Express
|April 11, 2013
PubMed
Summary
This summary is machine-generated.

This study presents an ultrafast infrared spectrometer with high spatial resolution for analyzing molecular dynamics. The novel setup achieves precise measurements of transient absorption and dichroism in biological and dye samples.

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Area of Science:

  • Spectroscopy
  • Biophysics
  • Materials Science

Background:

  • Ultrafast transient infrared (IR) spectroscopy is crucial for understanding rapid molecular processes.
  • Achieving high spatial resolution in mid-IR measurements presents significant technical challenges.
  • Characterizing transient absorption and dichroism requires sophisticated spectroscopic techniques.

Purpose of the Study:

  • To describe and validate a novel ultrafast transient IR spectrometer setup.
  • To demonstrate the system's capability for high spatial resolution mid-IR measurements.
  • To apply the setup for studying biological complexes and imaging molecular films.

Main Methods:

  • Utilized Schwarzschild objectives for focusing the probe beam to a diffraction-limited spot.
  • Employed modulated probe light polarization to detect transient sample dichroism.
  • Performed pump-probe measurements to analyze transient absorption and characterize noise sources.

Main Results:

  • Achieved very high spatial resolution in the mid-IR spectral region.
  • Successfully studied transient absorption in Photosystem II core complex.
  • Imaged an organized film of methylene blue chloride dye.
  • Noise analysis predicted a noise level of 8.25 μOD, closely matching experimental observation of 9.6 μOD.

Conclusions:

  • The developed ultrafast transient IR spectrometer offers exceptional spatial resolution for mid-IR spectroscopy.
  • The setup is effective for investigating complex biological systems and molecular films.
  • The noise performance is well-characterized and suitable for sensitive measurements.