The words). 3x10m/s 1.38x10^-23 J/K Doppler, Lorentzian Collisional, Lorentzian c) Natural radiative lifetime, Gaussian b) Doppler, Gaussian a Collisional, Gaussian which produces a At very high pressures in an amplifying medium, the predominant mechanism for line broadening is lineshape. (Select the correct pair of