Abstract

A unified approximate expression for the real part of the susceptibility for collisionially broadened transitions, including line coupling, has been developed. The Hilbert transform has been applied to the impact line shape (Kramers-Kronig relationship) to obtain a result that is applicable from the approximation microwave to the infrared. The approximate function has been compared numerically with the exact result a newly developed algorithm. The results are applicable to spectral computations of the index of using refraction and propagation delays.

© 1987 Optical Society of America

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