Linear Stark broadening occurs via the linear Stark effect, which results from the interaction of an emitter with an electric field of a charged particle at a distance , causing a shift in energy that is linear in the field strength. Resonance broadening occurs when the perturbing particle is of the same type as the emitting particle, which introduces the possibility of an energy exchange process. Quadratic Stark broadening occurs via the quadratic Stark effect, which results from the interaction of an emitter with an electric field, causing a shift in energy that is quadratic in the field strength. Van der Waals broadening occurs when the emitting particle is being perturbed by Van der Waals forces. For the quasistatic case, a Van der Waals profile"Van der Waals profile" appears as lowercase in almost all sources, such as: Statistical mechanics of the liquid surface by Clive Anthony Croxton, 1980, A Wiley-Interscience publication, , ; and in Journal of technical physics, Volume 36, by Instytut Podstawowych Problemów Techniki (Polska Akademia Nauk), publisher: Państwowe Wydawn. Naukowe., 1995, is often useful in describing the profile. The energy shift as a function of distance between the interacting particles is given in the wings by e.g. the Lennard-Jones potential.
Linear Stark broadening occurs via the linear Stark effect which results from the interaction of an emitter with an electric field of a charged particle at a distance  causing a shift in energy that is linear in the field strength Resonance broadening occurs when the perturbing particle is of the same type as the emitting particle which introduces the possibility of an energy exchange process Quadratic Stark broadening occurs via the quadratic Stark effect which results from the interaction of an emitter with an electric field causing a shift in energy that is quadratic in the field strength Van der Waals broadening occurs when the emitting particle is being perturbed by Van der Waals forces For the quasistatic case a Van der Waals profile"Van der Waals profile" appears as lowercase in almost all sources such as Statistical mechanics of the liquid surface by Clive Anthony Croxton 1980 A Wiley-Interscience publication  ; and in Journal of technical physics Volume 36 by Instytut Podstawowych Problemów Techniki (Polska Akademia Nauk) publisher Państwowe Wydawn Naukowe 1995 is often useful in describing the profile The energy shift as a function of distance between the interacting particles is given in the wings by eg the Lennard-Jones potential