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atomic process comparison table

Subject	has antonym	has definition
bound-bound transition		Transition between energy levels of an electron bound to a nucleus (the electron is bound both before and after the transition).
bound-free transition		Transition in which a bound electron in any energy level is liberated or its reverse process.
collision
free-free transition		The acceleration of an unbound (or free) electron by a proton or atomic nucleus results in the emission of electromagnetic radiation.
ionization	recombination	Loss or gain by an atom of one or more electrons, by which process the atom becomes an ion and instead of being neutral, has a charge: positive if it has lost an electron, negative if it has gained one. High temperature is particularly conducive to ionization.
recombination	ionization	The capture of an electron by a positive ion.

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