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 manufacturer Bruker to exit underperforming instrument lines | EVISA's News
Impressions from the analytica 2016 in Munich | EVISA's News
Instrument database: Bruker AXS GmbH - S8 DRAGON - XRF Spectrometer
Arsenic concentration in groundwater may be affected by bacteria | EVISA's News
Instrument database: Agilent Technologies Inc. - 1220 Infinity LC System
High levels of mercury found in mountain lions linked to coastal fog | EVISA's News
Directory of scientists: Ralf Kautenburger
Journals database: Journal of Fluorescence
Rice is the Major Pathway for Methylmercury Exposure in Inland China | EVISA's News
Directory of scientists: Sergi Díez
A universal method for the speciation analysis of arsenic in various seafoods | EVISA's News
Instrument database: Aurora Biomed - VG 411 Vapor/Hydride Generator
Material database: JRC - Joint Research Centre - BCR-626 - Arsenobetaine solution
Directory of scientists: David Amouroux
Instrument database: Aurora Biomed - LUMINA 3300 Atomic Fluorescence Spectrometer
Instrument database: Bruker Nano GmbH - S4 TStar - Benchtop TXRF Spectrometer
Instrument database: Analytik Jena GmbH - contrAA® 800 D - Dual Atomizer Atomic Absorption Spectrometer
Solid-phase extraction in speciation analysis | EVISA's News
Instrument database: Thermo Scientific - UltiMate™ 3000 Basic Automated System
Tellurium Speciation Analysis of Soil Samples Taken from an Area Associated with the Storage, Processing, and Recovery of Electrowaste | EVISA's News