A comprehensive cross section database has been constructed for the collision processes taking place in low temperature (0.1 - 100 eV) hydrogen plasmas. The species involved in considered collision processes include: e, H⁺, H, H^*(n), H^-, H₂(v), H₂^*(N,v), H₂⁺(v), H₃⁺(v), where n, N, v are the usual quantum numbers.
Of electron impact processes with neutral plasma constituents (in their ground or electronically/vibrationally excited state) the processes of excitation, ionization and attachment (radiative and dissociative) have been considered. Of electron impact processes with atomic and molecular ions the processes of electron detachment (in the case of H^-), radiative and three-body recombination (in the case of H⁺), and dissociative excitation and recombination (in the case of molecular ions) have been considered.
For proton collisions with neutral hydrogen atoms and molecules, the processes considered in the database include: excitation (electronic and vibrational), ionization, and electron capture (also to specific final product states). The mutual neutralization of protons with H^- has also been considered with separation of final n-state reaction channels.
In the class of neutral atom (molecule)-atom (molecule) the processes considered in the database include: excitation transfer, spin exchange, associative and non-associative ionization, and V-V and V-T energy transfer processes. The considered collision processes of H^- with H and H₂(v) include: charge exchange, and associative and non-associative electron detachment, while those with molecular ions include mutual (dissociative and non-dissociative) neutralization and associative and non-associative detachment. Finally, of collision processes of H₂⁺ and H₃⁺ with H and H₂(v) the state-selective processes of vibrational excitation, charge exchange (dissociative and non-dissociative), collision induced dissociation, H₃⁺ -ion formation and destruction have been considered.
The database has been constructed by critical assessment of available cross section information in the literature, and using appropriate simple theoretical models or well established scaling relationships to evaluate the unavailable cross sections. The database is published in [1].

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