At what minimum kinetic energy must a hydrogen atom move for its inelastic head-on collision with another,

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At what minimum kinetic energy must a hydrogen atom move for its inelastic head-on collision with another, stationary, hydrogen atom to make one of them capable of emitting a photon? Both atoms are supposed to be in the ground state prior to the collision.
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University Physics With Modern Physics

ISBN: 978-0073513881

2nd edition

Authors: Wolfgang Bauer, Gary Westfall

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