Filtered Rayleigh scattering Summary

7. Rayleigh scatteringIt d ti Introduction Rayleigh scatteringygg TheorySpecies concentration measurements Species concentration measurements Temperature measurements Filtered Rayleigh scattering Summary SummaryIntroduction: Why is the sky blue? Daytime sky looks blue on a clear dayThe sk looks red at s nset/s nrise The sky looks red at sunset/sunriseWhy? Rayleigh scattering !!The scattering intensity is proportional to -4A wavelength at 430 nm(in the blue) is thus scattered a factor of ~6 times as efficient as a wavelength of680 nm(in the red)gypp6 times as efficient as a wavelength of 680 nm(in the red).Joakim BoodThe physical principleElectromagnetic wave propagating along the z-axis. The polarization is gpvertical (along x-axis). The scattering in the y-z-plane is vertically polarized and of equal scattering = EWhen an electromagnetic wave interacts with an ; polarizability When an electromagnetic wave interacts with an atom/molecule/particle, the oscillating electric field creates an oscillating dipole, , when the electrons are moved back and tidildi tt thfth iidt An oscillating dipole radiates at the same frequency as the incident radiation, E = E sin2 , what is called Rayleigh scattering .

Rayleigh scattering line shape of N 2 at 1 atm and 500 K Scattering from particles and surfaces a filter (mercury) atm. and 500 K n b. units Transmitted molecular Rayleigh scattering. n With increasing smissio n sity / ar With increasing temperature, the line broadens and relatively more light Tra Inte relatively more light passes the molecular ...

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