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UV–Vis Spectrometers01:14

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
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An Introduction to Processing, Fitting, and Interpreting Transient Absorption Data
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An Introduction to Processing, Fitting, and Interpreting Transient Absorption Data

Published on: February 16, 2024

Note: a transient absorption spectrometer using an ultra bright laser-driven light source.

Man-Nung Su1, Jim Jr-Min Lin

  • 1Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan.

The Review of Scientific Instruments
|September 7, 2013
PubMed
Summary
This summary is machine-generated.

A new apparatus measures transient absorption spectra of short-lived gas-phase species. Synchronizing the detector gate with plasma oscillation significantly improved spectral baseline stability for accurate measurements.

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Area of Science:

  • Spectroscopy
  • Physical Chemistry
  • Chemical Physics

Background:

  • Transient absorption spectroscopy is crucial for studying short-lived species.
  • Laser-driven plasma sources offer high brightness and broad bandwidth.
  • Plasma oscillations can introduce baseline noise in spectral measurements.

Purpose of the Study:

  • To develop an apparatus for measuring transient absorption spectra of gas-phase species.
  • To address baseline instability issues caused by plasma oscillations.
  • To enhance the accuracy and reliability of time-resolved spectral measurements.

Main Methods:

  • Coupling a laser-driven plasma light source to a time-gated intensified-CCD spectrometer.
  • Implementing phase synchronization between the detector gate time and plasma oscillation frequency (~200 kHz).
  • Utilizing pulsed laser photolysis of dinitrogen pentoxide (N2O5) to generate excited nitrogen trioxide (NO3) radicals for system testing.

Main Results:

  • The developed apparatus successfully measures transient absorption spectra.
  • Synchronizing the detector gate with plasma oscillations significantly reduced baseline variations.
  • Achieved much greater stability of the spectral baseline compared to non-synchronized methods.
  • Demonstrated system performance through time-resolved absorption spectra of excited NO3 radicals.

Conclusions:

  • The synchronized detection method effectively mitigates baseline noise from plasma oscillations.
  • The apparatus provides a stable and reliable platform for studying short-lived species in the gas phase.
  • This technique enhances the precision of transient absorption spectroscopy for chemical dynamics research.