Of or relating to → collision.
collisional cross section
sekanj-e oskarmand-e hamkubeši
Fr.: section efficace de collision
Same as → cross section.
Fr.: désexcitation collisionnelle
The process when the energy difference between the excited and non excited states of an atom is taken away by an electron during a collision.
Fr.: excitation collisionnelle
A physical process which is caused by the free electrons that are energized either by → photoionization or → collisional ionization. Collisional excitation puts ions, atoms, and molecules into excited states from which they may decay radiatively. Collisional excitation is important in the → interstellar medium.
Fr.: chauffage par collisions
Fr.: ionisation collisionnelle
Fr.: plasma collisionnel
Fr.: plasma non-collisionnel:
A plasma in which the → mean free path of the charged particles between two collisions is much larger than the size of the system containing the plasma.