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Related Concept Videos

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.
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Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
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Updated: May 20, 2025

Synthesis and Characterization of High c-axis ZnO Thin Film by Plasma Enhanced Chemical Vapor Deposition System and its UV Photodetector Application
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First Measurement of Z Opacity Sample Evolution near Solar Interior Conditions Using Time-Resolved Spectroscopy.

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|March 25, 2025
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Summary
This summary is machine-generated.

High-temperature iron opacity measurements show persistent discrepancies. New ultrafast x-ray camera technology confirms temporal gradients do not explain these differences in opacity models.

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Area of Science:

  • Plasma physics
  • Astrophysical modeling
  • X-ray spectroscopy

Background:

  • Opacity model discrepancies persist for iron at high temperatures (T>180 eV) and densities (ne>3x10^22 cm^-3), relevant to stellar interiors.
  • Previous experiments relied on x-ray film, limiting temporal resolution.

Purpose of the Study:

  • To investigate the role of temporal gradients in opacity model-data discrepancies.
  • To present new measurements of opacity sample temporal evolution using advanced imaging technology.

Main Methods:

  • Utilized novel hCMOS ultrafast x-ray camera technology for high-resolution temporal measurements.
  • Measured opacity sample temporal evolution under high-temperature and high-density conditions.
  • Analyzed measured conditions, backlighter time history, and modeled opacities.

Main Results:

  • Demonstrated that temporal gradients do not resolve the long-standing model-data discrepancy in iron opacity.
  • Provided the first measurements of opacity sample temporal evolution.

Conclusions:

  • Temporal gradients are not the cause of the observed iron opacity discrepancies.
  • The new hCMOS camera technology enables opacity measurements at more extreme conditions and spectral line shift analysis.