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Lecture 5-Spectral lines (Line Broadening mechanisms (Intrinsic width…
Lecture 5-Spectral lines
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Spin quantisation
Electron and proton also characterised by spin quantum number s, can be up or down
If in aligned state, they have higher energy than mis-aligned state
HI emission line
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But because of high density and abundance of H, local equilibrium of spin transitions maintained purely by collisions in hydrogen gas
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