fluorescence

Fluorescence is the spontaneous emission of light shortly after the excitation of a material by an electron transition. The fluorescence photons are usually lower in energy than the excitation photons (= Stokes shift). The fluorescence typically has a lifetime (or duration) of nanoseconds (10−9 s) per transition. A fluorescence spectrophotometer normally has an excitation monochromator that defines the excitation energy, and an emission monochromator that provides a full spectrum of the fluorescence emission. Note that fluorescence is the most common interference in Raman spectra and that fluorescence is a strong background interferent of Raman scattering. Often the much stronger fluorescence masks the weaker Raman signal. This is often true for resonance Raman and also for heterogenous biological or mineralogical samples. Also traces of impurities can lead to fluorescence masking the Raman signal.



The term "fluorescence" was found in the following pages:

Ultratrace determination of methylmercury in seawater using automated GC-AFS | EVISA's News
New way of cooking rice removes arsenic and retains mineral nutrients, study shows | EVISA's News
A universal method for the speciation analysis of arsenic in various seafoods | EVISA's News
Instrument database: Analytik Jena GmbH - mercur – Combined AAS/AFS spectrometer for mercury determination
CE-ICP-MS for speciation analysis | EVISA's News
Solid-phase extraction in speciation analysis | EVISA's News
ICP-MS: A versatile detection system for trace element and speciation analysis | EVISA's News
Liquid-liquid extraction in speciation analysis | EVISA's News
Trace element speciation analysis for environmental sciences | EVISA's News
Arsenic Species in Seaweeds Commercially Available in the United States | EVISA's News
Instrument database: Analytik Jena GmbH - multi EA® 3100 Element Analyzer
On-column internal standardisation as an alternative calibration strategy for speciation analysis | EVISA's News
Tellurium Speciation Analysis of Soil Samples Taken from an Area Associated with the Storage, Processing, and Recovery of Electrowaste | EVISA's News
Material database: Institute of Nuclear Chemistry and Technology (INCT/ICHTJ) - CTA-OTL-1 ORIENTAL TOBACCO LEAVES
Instrument database: Analytik Jena GmbH - contrAA® 800 D - Dual Atomizer Atomic Absorption Spectrometer
All about Atomic Spectrometry - Resources related to Atomic Spectrometry | EVISA's News
Instrument database: Analytik Jena GmbH - contrAA® 800 F - HRCS- Atomic absorption spectrometer for flame and hydride techniques
Directory of scientists: Nelson Belzile
Scientific publications with participation of EVISA | EVISA's News
Directory of scientists: Carlos Bendicho Hernández