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Answer by ProfRob for What's the force experienced by a hydrogen atom when it...

The rate of photon absorption is $$ n = \int B_{12}I(\nu)\phi(\nu) d\nu\ ,$$per atom, where $I(\nu)$ is the specific intensity, $B_{12}$ is the absorption Einstein coefficient (as defined by this...

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Answer by Roger V. for What's the force experienced by a hydrogen atom when...

As I mentioned in the comments, the mechanism described in the OP is used in the laser cooling of atoms, and the detailed derivations of the force can be found by googling (although they may be...

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What's the force experienced by a hydrogen atom when it absorbs photons?

Suppose a hydrogen atom is a distance $d$ away from a star (approximate the star as a blackbody). The radius of the star is $R$ and the its temperature is $T$. The hydrogen atom absorbs photons from...

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