Collision broadening in two-photon spectroscopy

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Abstract
Collision-broadening theory is used to obtain a general expression for the steady-state rate of two-photon simultaneous absorption as a function of their sum energies and momenta in gases, under conditions where both homogeneous (collision) and inhomogeneous (Doppler) broadening take place. Effects of molecular motion on the line-broadening parameters are discussed, as well as extensions to bands of overlapping lines, inclusion of radiative damping, saturation effects, effect of intermediate resonating levels (consecutive absorption), and time-resolved experiments.
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