title: Complex susceptibility for collisional broadening.
abstract: A unified approximate expression for the real part of the susceptibility for collisionally broadened transitions, including line coupling, has been developed. The Hilbert transform has been applied to the impact approximation line shape (Kramers-Kronig relationship) to obtain a result that is applicable from the microwave to the infrared. The approximate function has been compared numerically with the exact result using a newly developed algorithm. The results are applicable to spectral computations of the index of refraction and propagation delays.
authors.forename: K
authors.initials: K
authors.lastname: Tomiyama
authors.forename: S A
authors.initials: SA
authors.lastname: Clough
authors.forename: F X
authors.initials: FX
authors.lastname: Kneizys