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Which mechanism causes spectral line broadening in plasmas?

A)Stark effect due to ion microfields
B)Doppler shift from electron collisions
C)Cyclotron emission from free electrons
D)Bremsstrahlung radiation from nuclear interactions

💡 Explanation

The Stark effect broadens spectral lines because the fluctuating electric fields from nearby ions cause energy level splitting via Quantum Mechanical Coupling with free neighbours; therefore, spectral lines broaden, rather than exhibiting Doppler shift due electron thermal motion or bremsstrahlung due to electron-ion. interactions.

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