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:

Instrument database: Analytik Jena GmbH - contrAA 800 D - Dual Atomizer Atomic Absorption Spectrometer
Material database: Institute of Nuclear Chemistry and Technology (INCT/ICHTJ) - CTA-OTL-1 ORIENTAL TOBACCO LEAVES
Impressions from the European Winter Conference on Plasma Spectrochemistry that took place February 3-8, 2017 in Pau (France) | EVISA's News
Instrument database: Bruker AXS GmbH - S8 DRAGON - XRF Spectrometer
Arsenic speciation in rice: a question of the rice plant species | EVISA's News
Spectr'Atom 2014 | EVISA's Agenda of Events
Instrument database: Shimadzu Europe - RF-20A/RF-20AXS Fluorescence Detector
Journals database: Guangpuxue Yu Guangpu Fenxi = Spectroscopy and Spectral Analysis (Beijing)
CE-ICP-MS for speciation analysis | EVISA's News
Instrument manufacturer Bruker to exit underperforming instrument lines | EVISA's News
GC-ICP-MS: A very sensitive hyphenated system for speciation analysis | EVISA's News
Books and Special Issues on Elemental Speciation (published since 2011) | EVISA's News
Occurrence of monoethylmercury in the Florida Everglades verified | EVISA's News
Elephant seals’ fur as a source for methylmercury in coastal sea water | EVISA's News
Depleted uranium gets mobilized by phosphate fertilizer | EVISA's News
Directory of scientists: Vera I. Slaveykova
Instrument database: Bruker Nano GmbH - M1 MISTRAL: Compact Tabletop µ-XRF Spectrometer
Instrument database: Bruker Nano GmbH - M6 JETSTREAM - Large Area Micro X-ray Fluorescence Spectrometer
TURCMOS2019: 4th International Turkish Congress on Molecular Spectroscopy | EVISA's Agenda of Events
New quick test for methylmercury | EVISA's News