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Related Concept Videos

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Atomic Fluorescence Spectroscopy01:29

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Deflection of a Beam01:19

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Accurately determining beam deflection and slope under various loading conditions in structural engineering is crucial for ensuring safety and structural integrity. Singularity functions offer a streamlined approach to analyzing beams, especially when multiple loading functions complicate the bending moment equation.
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When analyzing beams under unsymmetrical loads, such as a train moving on a bridge, it is crucial to accurately determine the points of maximum stress and deflection. The process involves identifying the maximum deflection of the beam, which may not always occur at its midpoint due to the uneven distribution of the load.
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Absolute Quantum Yield Measurement of Powder Samples
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Absolute fluorescence quantum yield determined by photothermal deflection spectroscopy.

B Couch1, A Meyer1, B Heller1

  • 1Department of Physics, Transylvania University, Lexington KY, United States of America.

Methods and Applications in Fluorescence
|November 10, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces a novel spectroscopic method to measure fluorophore quantum efficiency without calibration standards. The technique combines Photothermal Deflection Spectroscopy with absorbance spectroscopy for accurate, single-measurement results.

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Area of Science:

  • Photochemistry
  • Spectroscopy
  • Materials Science

Background:

  • Accurate measurement of fluorescence quantum efficiency (ΦF) is crucial for understanding photophysical processes.
  • Traditional methods often require calibration standards and multiple measurements, increasing complexity and potential for error.

Purpose of the Study:

  • To develop a calibration-free spectroscopic method for determining fluorescence quantum efficiency (ΦF).
  • To validate the new method using diverse organic dyes across the visible spectrum.

Main Methods:

  • Integration of Photothermal Deflection Spectroscopy (PDS) with conventional absorbance spectroscopy.
  • Extraction of ΦF from spectral fits, eliminating the need for calibration standards or concentration-dependent measurements.

Main Results:

  • The developed method accurately measures ΦF in a single experiment.
  • Results for five organic dyes with ΦF ranging from 0 to 1 were consistent with literature values.
  • The technique demonstrated robustness across varying wavelengths and quantum yields.

Conclusions:

  • This calibration-free spectroscopic approach provides an efficient and accurate means to determine fluorescence quantum efficiency.
  • The method's efficacy and robustness make it a valuable tool for photophysical studies.