FLUORESCENCE - Emission of electromagnetic radiation, especially of light, that results from bombardment of a substance with other forms of electromagnetic radiation. This spontaneously emitted radiation ceases immediately after excitation ceases.
Fluorescence
(a) The absorption of energy by atoms, molecules, etc., followed by immediate emission of electromagnetic radiation as the particles make transitions to lower energy states.
Fluorescence is a luminescence that is mostly found as an optical phenomenon in cold bodies, in which the molecular absorption of a photon triggers the emission of a photon with a longer wavelength....
that surrounded the sheet.
[edit] Fluorescence
Spectrum of light from a fluorescent lamp showing prominent mercury peaks
Main article: Fluorescence spectroscopy ...
Fluorescence spectroscopy Fluorescence spectroscopy uses higher energy photons to excite a sample, which will then emit lower energy photons.
fluorescence The absorption of a photon of one energy, or wavelength, and re-emission of one or more photons at lower energies, or longer wavelengths. [More Info: Field Guide] ...
fluorescence - The absorption of light of one wavelength and reemission of it at another wavelength; especially the conversion of ultraviolet into visible light.
X-ray Fluorescence Spectrometer
Detectors: 3 gas-filled proportional counters; 25-cm2 active aperture area; 25-mm beryllium window, uniformity ~ ±5% ; Beryllium liner and window support
In-flight calibration sources: 55Fe ...
x ray fluorescence spectroscopy (Global Land Information System Glossary - USGS) This non-destructive analytical technique is used to determine concentrations of specific chemical elements.
Hydrodynamic equations often used to analyze the onset of convection in a fluid by allowing for the variations of density only insofar as buoyancy forces are concerned. [H76]
Bowen Fluorescence Mechanism ...
Emission spectrum (fluorescence spectroscopy)Emission standardEmission test cycle
Emission theoryEmission theory (vision)Emissions control
Emissions tradingEmitEmita Babazadeh ...
Compare fluorescence. An example of phosphorescence is the glowing of an oscilloscope screen after the exciting beam of electrons has moved to another part of the screen.
The nebula is lit up by the fluorescence of the hydrogen gas around a O-type star in the Trapezium cluster of four stars at the heart of the nebula. The O-type star is so hot that it produces a large amount of ultraviolet light.
The phenomenon of fluorescence involves the structure of atoms (see Inside an Atom).
Blocking UV light Visible light penetrates glass. We can see it! But UV light does not. Put a fluorescent mineral inside a light box containing a UV source.
The prime example is the O III resonance-fluorescence mechanism found by Bowen. There is a very close coincidence between He II Lyman a at 303.78 Å and a pair of O III lines at 303.62, 303.80 Å.
an X-ray diffraction and fluorescence instrument
a radiation detector
a descent imager
a gas chromatograph mass spectrometer
a tunable laser spectrometer
a pulsed neutron source and detector
a meteorological package with ultraviolet sensor ...
The Orion Nebula shines by a form of fluorescence, its radiating gases ionized by the ultraviolet light from a set of four hot stars that appear in the middle collectively known as the Trapezium (Theta-1 Ori), ...
and if the whole apparatus be placed in a completely darkened room, there is observed at each discharge a bright illumination of a paper screen covered with barium platinocyanide, placed in the vicinity of the induction-coil, the fluorescence thus ...
Shortly afterwards, the atoms emit their gained energy as light (see Fluorescence).
More specifically, I was involved with improving algorithms for detecting chlorophyll fluorescence in algae particles. Detection of this parameter is vital because of its applications.
After landing, a small surface sample near the probe was analyzed by gamma spectroscopy and x-ray fluorescence.
Raman spectroscopy The study of spectra caused by the scattering and change in frequency of light due to the transition between vibrational/rotational energy levels in molecules.
Stark spectroscopy
Fluorescence spectroscopy
X-ray fluorescence ...
Galileo images have also shown that the Ra Patera plume glows in the dark, perhaps due to the fluorescence of sulfur and oxygen ions created by the breaking apart of sulfur dioxide molecules by energetic particles in the Jovian magnetosphere.
When a coma develops, dust reflects sunlight, while gas in the coma absorbs ultraviolet radiation and begins to fluoresce. At about 5 AU from the sun, fluorescence usually becomes more intense than the reflected light.
The most advanced ground-based experiments to detect cosmic ray showers extend over several kilometres and consist of both Cherenkov detectors monitoring several large tanks of water for light produced by high-energy particles, and fluorescence ...
However, when a coma develops, dust reflects still more sunlight, and gas in the coma absorbs ultraviolet radiation and begins to fluoresce. At about five AUs from the Sun, fluorescence usually becomes more intense than reflected light.
 See also: Light, Energy, Time, Field, Earth
  
|
RSS
