Energy flux in optics in hydrogen gas

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SUMMARY

The discussion centers on the energy flux of a plane wave incident on hydrogen gas, characterized by a density of n atoms per cubic meter. The relationship governing the energy flux is defined by the equation d∅/dz = -nσ(ω)∅(z), where σ(ω) represents the diffusion cross-section. The solution for the energy flux ∅(z) is derived as ∅(z) = ∅0 exp(-z/L), indicating that L shares the same dimensions as z. This clarification resolves the confusion regarding the interpretation of L in the context of the problem.

PREREQUISITES
  • Understanding of wave mechanics and energy flux concepts
  • Familiarity with diffusion cross-section in optics
  • Basic knowledge of hydrogen gas properties and density measurements
  • Proficiency in solving differential equations related to physical phenomena
NEXT STEPS
  • Study the derivation of the diffusion cross-section σ(ω) in various media
  • Explore the implications of energy flux in different gases and their densities
  • Learn about the application of exponential decay in wave propagation
  • Investigate the role of luminance in optical physics and its measurement
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Students and researchers in optics, physicists studying wave propagation in gases, and anyone interested in the mathematical modeling of energy flux in various media.

kirikoo
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Homework Statement


There is a half space z>0 full with hydrogen gas with density n atoms / metres cube.
An incident wave plane with pulsation ω coming from z = -∞ arrives at the surface of incidence. This wave transports a flux of energy ∅0 at z=0.
We consider a elementary cylinder whose axe along z with section S between z and z+dz
Prove that the flux of energy of the wave is given by d∅/dz= -nσ(ω)∅(z) , σ(ω) is the diffusion cross-section. And therefore ∅(z) = ∅0(z)exp(-z/L).
I suppose L is the luminance.

Thank you for your help.



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The Attempt at a Solution

 
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I don't think L is the luminance. Shouldn't it have the same units as z?
 
Yes, of course stupid mistake from me. L has the same dimension as z. But still i have no answer for my question:approve:
 

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