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Topic: Scattering


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  Blue Sky and Rayleigh Scattering
Therefore the light scattered down to the earth at a large angle with respect to the direction of the sun's light is predominantly in the blue end of the spectrum.
Scattering in which the scattered photons have either a higher or lower photon energy is called Raman scattering.
Mie scattering is not strongly wavelength dependent and produces the almost white glare around the sun when a lot of particulate material is present in the air.
hyperphysics.phy-astr.gsu.edu /hbase/atmos/blusky.html   (703 words)

  
 Scattering
Scattering experiments were rare in physics before quantum mechanics, except perhaps in relation to the scattering of light by colloids and density fluctuations.
After quantum mechanics, scattering experiments became the principal method for the study of atoms, molecules and nuclei, since the properties of the scattering system were reflected in the scattering process.
At first sight, the scattering problem would appear to be a very difficult time-dependent problem involving the coordinates of two particles that initially are separated wave packets, then they move into the same region and interact, and finally separate into two wave packets moving relatively in a new direction.
www.du.edu /~jcalvert/phys/scat.htm   (7023 words)

  
 scattering concept from the Astronomy knowledge base   (Site not responding. Last check: )
Scattering by free electrons was the dominant source of opacity in the early universe.
Brillouin scattering (2 facts) - Slight changes in the frequency of radiation, caused by reflection or scattering from the high-frequency sound waves that arise from thermal vibrations of atoms in the medium.
The energy of the scattered photon is the same (in the rest frame of the atom) as that of the incident photon.
www.site.uottawa.ca:4321 /astronomy/scattering.html   (491 words)

  
 Rayleigh Scattering
The scattering of light by gases was first treated quantitatively by Lord Rayleigh in 1871 in an effort to explain the blue colour of the sky and the red colour of the sunset.
Rayleigh scattering theory is applicable to scattering of UV and visible radiation by air molecules, infra-red radiation by small aerosols, and microwave radiation by cloud and rain drops.
and from equation (2.39), the Rayleigh scattering cross-section is,
www.ess.uci.edu /~cmclinden/link/xx/node20.html   (323 words)

  
 Scattering Summary   (Site not responding. Last check: )
Scattering is a general physical process whereby some form of radiation, such as light, sound, or moving particles, is forced to deviate from a straight trajectory by one or more localized non-uniformities in the medium through which it passes.
Light scattering can also give color to some objects, usually shades of blue (as with the sky, the human iris, and the feathers of some birds), but resonant light scattering in nanoparticles can produce different highly saturated and vibrant hues, especially when surface plasmon resonance is involved.
Rayleigh scattering is a process in which electromagnetic radiation (including light) is scattered by a small spherical volume of variant refractive index, such as a particle, bubble, droplet, or even a density fluctuation.
www.bookrags.com /Scattering   (2980 words)

  
 AMS Glossary
Sometimes scattering is applied in a restricted sense to that radiation not accounted for by the laws of specular reflection and refraction, which are approximate because matter is not continuous on all scales.
Often the term scattered radiation is applied to that radiation observed in directions other than that of the source and may also be applied to acoustic and other waves.
Scattering is also applied to any interaction between particles that results in a change in direction.
amsglossary.allenpress.com /glossary/search?id=scattering1   (203 words)

  
 Light Scattering   (Site not responding. Last check: )
Note also that the amount of light scattered varies inversely as the fourth power of the light wavelength, showing that blue light (of wavelength ~400 nm) is scattered about 5 times more effectively as red light (of wavelength ~600 nm), giving Rayleigh the credit for quantitatively explaining the blue sky and the red sunrise/sunset.
That there should be scattering from a transparent liquid was not understood until the early part of this century when the German scientist Einstein and the Russian scientist Smoluchovski (working independently) used thermodynamic arguments to explain both the scattering from the liquid solvent and the excess scattering upon the addition of polymer as a solute.
The interpretation of this is that the scattering from the PVP molecules is enhanced by aggregating SDS (thus increasing the molecular weight of the molecule) until the molecules are saturated (quite literally have no more room), at which point the scattering saturates.
www.phys.selu.edu /dave/research/LScattering/LightScatt.HTM   (2810 words)

  
 Scattering cremated remains by airplane
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We scatter ashes, scatter ashes by air, scatter ashes by airplane, scatter cremated remains by airplane, scatter cremated ashes by airplane.
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www.scatteringbyair.com   (205 words)

  
 Scattering and Form Factors
Consider the scattering of an electron by a nucleus, as discussed in the Nuclear Physics course in the determination of nuclear size.
At low energies, the centre of mass frame is almost the same as the laboratory frame, since the mass of the electron is very much less than that of the nucleus.
NOTE: The Fourier relationship between scattered amplitude and spatial distribution of the scatterer is general, e.g.
www.shef.ac.uk /physics/teaching/phy304/scattering.html   (647 words)

  
 Dynamic Light Scattering
Dynamic light scattering (DLS) theory is a well established technique for measuring particle size over the size range from a few nanometers to a few microns.
It is this difference in the frequency of the scattered light among particles of different sizes that is used to determine the sizes of the particles present.
The constant g appears as a particle characteristic frequency of the response and is a function of the wavelength, l, scatter angle, q, and the diffusion coefficient, D. The diffusion coefficient, D, is a value that describes the movement of a particle in suspension relative to other particle sizes.
www.microtrac.com /dynamicscattering.cfm   (1518 words)

  
 Laboratory for Neutron Scattering
According to the laboratory's designation neutron scattering constitutes the main research area.
Neutron scattering measurements provide information on an atomic scale about the static and dynamical properties of condensed matter which - in many cases - is obtainable in no other way.
Besides these research activities the laboratory is responsible for the operation, further development and extension of the instrumentation set up at the spallation source SINQ at the PSI Villigen for neutron scattering experiments.
lns.web.psi.ch   (271 words)

  
 Neutron scattering lengths and cross sections
Select the element, and you will get a list of scattering lengths and cross sections.
All of this data was taken from the Special Feature section of neutron scattering lengths and cross sections of the elements and their isotopes in Neutron News, Vol.
A long table with the complete list of elements and isotopes is also available.
www.ncnr.nist.gov /resources/n-lengths   (177 words)

  
 [No title]
Scattering is when solar radiation is deflected from its path in all directions.
Scattering is caused by particles in the atmosphere.
The color of the light scattered is a function of the particle size in relation to the wavelength.
cimss.ssec.wisc.edu /wxwise/class/optics.html   (671 words)

  
 Atmospheric Scattering
Scattering is the process by which "small particles suspended in a medium of a different index of refraction diffuse a portion of the incident radiation in all directions." With scattering, there is no energy transformation, but a change in the spatial distribution of the energy.
If it was not for scattering, we would not be able to see shadowed objects such as walnuts that have fallen on the ground under the shading of a tree.
Mie scattering is caused by pollen, dust, smoke, water droplets, and other particles in the lower portion of the atmosphere.
www.severewx.com /Radiation/scattering.html   (499 words)

  
 Scattering parameters.
This incoming wave is "scattered" by the circuit and its energy is partitioned between all the possible outgoing waves on all the other transmission lines connected to the circuit.
The scattering parameters are fixed properties of the (linear) circuit which describe how the energy couples between each pair of ports or transmission lines connected to the circuit.
A visual demonstration of the meaning of scattering may be given by throwing a piece of chalk at a flboard....
www.ee.surrey.ac.uk /Personal/D.Jefferies/sparam.html   (1535 words)

  
 Compton scattering Summary
Compton scattering is of prime importance to radiobiology, as it happens to be the most probable interaction of high energy X rays with atomic nuclei in living beings and is applied in radiation therapy.
Compton scattering has on occasion been proposed as an alternative explanation for the phenomenon of the redshift by opponents of the Big Bang theory, although this is not generally accepted because the influence of the Compton scattering would be noticeable in the spectral lines of distant objects and this is not observed.
Compton Scatter is an important effect in Gamma spectroscopy, as it is possible for the gamma rays to scatter out of the detectors used.
www.bookrags.com /Compton_scattering   (899 words)

  
 Mie Scattering   (Site not responding. Last check: )
The optical theories applied in the present study describe the light scattering properties of an isolated spherical particle and therefore cannot be applied to systems in which the particles are crowded together and near-field interactions between particles are significant.
is the average cosine of the scattering angle, weighted by the intensity of the scattered light as a function of angle.
Scattering coefficient S versus sphere diameter for an optically isotropic sphere from Mie theory, using the average index approximation.
www.lrsm.upenn.edu /~frenchrh/mie_scattering.htm   (768 words)

  
 Laser Light Scattering - Precision Detectors Inc.
In brief, the light intensity scattered by a macromolecule in solution that is small compared with the wavelength of the incident laser beam is proportional to the concentration (c) multiplied by the molecular weight (Mw).
When a Rayleigh light scattering detector is used with a GPC/SEC system, the concentration of the sample in solution eluting from the light scattering detector can be measured by a concentration detector (typically a refractive index detector or a UV detector) in series with it in the eluting mobile phase stream.
In dynamic light scattering detection, the diffusion constant of the molecules moving randomly in the solution is calculated from the autocorrelation function of the scattered light.
www.lightscatter.com /AboutLightScattering.html   (544 words)

  
 Rutherford Scattering
Nevertheless, the relation between large angle scattering and the size of the positive sphere is clear from the model.
Rutherford correctly deduced that in the large angle scattering, which corresponded to closer approach to the nucleus, the alpha was actually hitting the nucleus.
Scattering from heavy nuclei was fully accounted for by the electrostatic repulsion, so Rutherford concentrated on light nuclei, including hydrogen and nitrogen.
galileo.phys.virginia.edu /classes/252/Rutherford_Scattering/Rutherford_Scattering.html   (2533 words)

  
 Small Angle X-ray Scattering (SAXS)
Scattering laws in the small angle regime describe two main features that are observed in a log Intensity versus log q plot.
All scattering patterns in the small-angle regime reflect a decay of intensity in q and this can be easily described by considering that at decreasing size scales the number of electrons in a particle is proportional to the decreasing volume, while the number of such particles increases with 1/volume.
Consider that scattering from a rod is observed at "r" = 1/q between the rod length, L, and the rod diameter, D. Then the number of scattering elements in the rod of size "r" is equal to L/r or Lq.
www.eng.uc.edu /~gbeaucag/Classes/Analysis/Chapter8.html   (1743 words)

  
 NIST Optical Scattering from Surfaces
Optical scattering is also used to assess uniformity of periodic structures such as found on compact disks, patterned photoresists, and deposited lines on semiconductors.
Experiments are underway to correlate the optical scatter from silicon wafers with properties such as surface microroughness, particulate contamination, and subsurface defects in order to facilitate optical scattering measurements in assembly line applications.
Scattering by slightly non-spherical particles on surfaces (Preprint 58 kB), T.A. Germer, in Seventh Conference on Electromagnetic and Light Scattering by Nonspherical Particles: Theory, Measurements, and Applications, in press, (2003).
physics.nist.gov /Divisions/Div844/facilities/osm/osm.html   (1430 words)

  
 Scattering cremated remains by airplane
California Health and Safety code governs the scattering of Cremated remains, and this code allows remains to be scattered where no local prohibition exists, with the written permission of the property owner or governing agency.
Scattering at sea, or the inland navigable waters of the state, must be conduced 500 yards off shore.
Scattering into lakes and streams is not allowed, nor is the scattering from a bridge or pier.
www.scatteringbyair.com /faq.htm   (824 words)

  
 Thomson scattering
It is clear that the differential scattering cross section is independent of the frequency of the incident wave, and is also symmetric with respect to forward and backward scattering.
The frequency of the scattered radiation is the same as that of the incident radiation.
The scattering of a photon by a charged particle is called Compton scattering, and the quantum mechanical version of the Compton scattering cross section is known as the Klein-Nishina formula.
farside.ph.utexas.edu /~rfitzp/teaching/jk1/lectures/node85.html   (722 words)

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