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Polarization Effects on Fluorescence Measurements.

E D Cehelnik1, K D Mielenz1, R A Velapoldi1

  • 1Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234.

Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry
|March 19, 2020
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Summary
This summary is machine-generated.

This study analyzes how polarization affects fluorescence measurements, considering four key variables. Mathematical models were developed and experimentally verified for accurate spectrofluorimeter operation.

Keywords:
Emission anisotropyfluorescencefluorescence quantum yieldfluorescence standardsfluorimetrypolarizationspectrofluorimetryviewing angle

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Photophysics

Background:

  • Fluorescence measurements are influenced by light polarization.
  • Understanding these polarization effects is crucial for accurate quantitative analysis.
  • Existing models may not fully account for all polarization variables.

Purpose of the Study:

  • To theoretically analyze and mathematically model the polarization effects in fluorescence measurements.
  • To experimentally validate the developed models using a high-emission anisotropy sample.
  • To provide recommendations for optimal spectrofluorimeter operation and calibration.

Main Methods:

  • Theoretical analysis of polarization effects involving four variables: exciting light polarization ratio (F), sample emission anisotropy (r), detection system polarization ratio (G), and viewing angle (α).
  • Development of mathematical models for different fluorimeter operational modes.
  • Experimental verification using Nile Blue A Perchlorate in glycerol, a sample with high emission anisotropy.
  • Utilized a recently designed goniospectrofluorimeter for measurements.

Main Results:

  • Fluorescence intensity and degree of polarization are functions of F, r, and α.
  • Spectrofluorimeter readings are influenced by all four variables: F, r, α, and G.
  • Experimental data validated the theoretical models, demonstrating their applicability.
  • Calibration procedures were established for accurate measurements.

Conclusions:

  • A comprehensive understanding of polarization variables is essential for precise fluorescence spectroscopy.
  • The developed mathematical models offer a robust framework for spectrofluorimeter data analysis.
  • The study provides practical guidelines for improving fluorescence measurement accuracy and reliability.