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We study the one-photon scalar pair production QED process on the expandingde Sitter spacetime. Using perturbation theory, we obtain the transitionprobability and study its properties as a function of the expansion parameter$\omega$. On flat space the process is forbidden by energy-momentumconservation. It is expected that for a dynamical background there is an energyexchange correlate to the strength of the gravitational field. We use momentumspace plots and compute the mean production angle to illustrate this. We showthat the mean angle grows with $\omega$, but also find that in the flat limitthe fall-off is unexpectedly slow. To investigate this further we obtain theprobability around different angular configuration, at leading order in$m/\omega$, and find that the $\omega$ dependence at small angles is very weak.We comment on the possible astrophysical implications.

One-photon pair production on the expanding de Sitter spacetime