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Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
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In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
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Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
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The Beer-Lambert law describes the relationship between absorbance and concentration, which combines the principles established by scientists Johann Heinrich Lambert and August Beer. Lambert's law states that when light passes through a medium, the loss in intensity is directly proportional to the original intensity and the path length of the light. Beer's law proposed that the transmittance of a solution remains constant if the product of concentration and path length is constant. The...
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Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
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Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
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Updated: Aug 25, 2025

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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Flow-Enhanced Photothermal Spectroscopy.

Ulrich Radeschnig1, Alexander Bergmann1, Benjamin Lang1

  • 1Institute of Electrical Measurement and Sensor Systems, Graz University of Technology, 8010 Graz, Austria.

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|October 14, 2022
PubMed
Summary
This summary is machine-generated.

Signal intensity in photothermal spectroscopy (PTS) using a Fabry-Pérot interferometer (FPI) depends on excitation modulation frequency and gas flow velocity. We identified an optimal working regime for improved gas sensing performance.

Keywords:
Fabry–Pérot interferometerPTS sensorsgas sensingphotothermal spectroscopy

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Area of Science:

  • Gas sensing
  • Spectroscopy
  • Optical instrumentation

Background:

  • Photothermal spectroscopy (PTS) is a key technique for gas and aerosol measurement.
  • Fabry-Pérot interferometer (FPI)-based PTS systems offer robustness and miniaturization potential.
  • Optimizing PTS signal intensity requires understanding parameter interactions.

Purpose of the Study:

  • To investigate the influence of excitation modulation frequency and gas flow velocity on FPI-based PTS signal intensity.
  • To develop an analytical model for predicting PTS signal intensity based on these parameters.
  • To identify an optimal working regime for enhanced gas sensing.

Main Methods:

  • Utilized a collinear excitation laser configuration in an FPI-based PTS setup.
  • Systematically varied excitation modulation frequency and gas flow velocity.
  • Developed and experimentally validated an analytical model correlating signal intensity with parameter settings.

Main Results:

  • Demonstrated significant impact of the ratio between modulation frequency and gas flow velocity on thermal wave generation and signal intensity.
  • The analytical model accurately predicted experimental signal intensities.
  • Identified a specific optimal working regime for the FPI-based PTS system.

Conclusions:

  • The interplay between modulation frequency and gas flow velocity is critical for optimizing FPI-based PTS performance.
  • The developed model provides a valuable tool for tuning PTS systems for improved gas sensing.
  • This study elucidates a key operational parameter for enhancing FPI-based photothermal spectroscopy.