New answers tagged


Scattering is phenomenon of deviation from its trajectory due to non-uniformities in medium through which it is passing. Eg. When a ball is deviated by tennis bat due to its motion. Flourescnce is consuming the photon, and emitting back lower energy photon.


There are several broadening mechanisms, and you have to know how they "add" together. Since a Voigt profile is the convolution of a Gaussian and Lorentzian profile, you rightly calculated both widths rather than just the overall width of the Voigt peak. For the Lorentzian portion, the width is the arithmetic sum of the individual widths: $ \Delta ...


I would note that Mn54 has a 300 day half life, and also emits at 834keV - you are likely seeing activation of material from the past neutron activity (Mn is a fairly standard alloying addition in steels and aluminum alloys).


The incident light is many many orders of magnitude brighter than the light at the Raman frequencies. If you let the fundamental in, it will bounce around whatever spectrometer and detector that you have, and inevitably some (sometimes a lot) of that light will reach the detector. Note that this is light that has scattered off of walls and baffles and ...


Index of refraction and the extinction coefficient are related to real and imaginary parts of dielectric function via a simple functions. Empirical real and imaginary parts of a dielectric function (or Lorentz oscillator fits to them) are usually used when simulating macroscopic Maxwell equations. So, what is missing (assuming you do not mean the trivial, ...


For a gas: Density Nuclear half-life of the components Viscosity Temperature of liquefaction Specific heat Speed of sound Rayleigh scattering coefficient


Take the fluorescence properties of a material for example. You cannot predict the time decay properties of the material subject to illumination just by knowing the refractive indexes.


When the electron falls to its ground state, it will emit the photon in a random direction.This means that the photon might not travel in the direction as the rest of the white light. In the absorption spectrum of the sun, there will be some photons of the characteristic frequency of helium, but significantly less than the rest of the spectrum, meaning a ...

Top 50 recent answers are included