How to remove doppler & pressure broadeneing?

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Rajib Biswas Popular answer

Except at very low frequencies, pressure broadening can be removed by working at very low pressures. Likewise, Doppler can be eliminated two ways. One is by using effusive atomic or molecular beams. The other is by Lamb dip Spectroscopy.

Rajib Biswas

Aiman Shamim

thank you Rajib Biswas,

Doppler broadening can be correcte by back ground correction methods?