Pressure broadening of an anticrossing signal

J. Derouard , R. Jost , M. Lombardi

We show that the pressure broadening of the width 2 √(4 V 2 + (ħΓ)2) of an anticrossing signal (where V is the coupling between the anticrossing levels and Γ the reciprocal of their lifetime) is caused by more than just the increase of Γ by collisions. We find that the linewidth is given by 2 √(4 V2 abγ/γ + (ħ abγ)2), where abγ/γ is the ratio of the effective relaxation times of the coherences to the populations of the anticrossing levels.

Mots clés: atomic collision processes; energy level crossing; helium atoms; spectral line breadth; anticrossing signal; pressure broadening; linewidth; quantum optics; optical pumping

Domaines: Articles anciens

J. Derouard, R. Jost, M. Lombardi. Pressure broadening of an anticrossing signal. Journal de Physique Lettres, 1976, 37 (6), pp.135-138. ⟨10.1051/jphyslet:01976003706013500⟩. ⟨jpa-00231257⟩