# Q&A_QEC: Momentum Transfer and differential cross sections

Q: Can QEC calculate the momentum transfer, differential and integrated differential cross-section? Does it only provide scattering cross-section data on elastic collisions between electrons and ground-state molecules or other processes too?

A: Yes it does calculate all of them for elastic collisions and rotational excitation. Specifically, the PolyDCS module of UKRmol calculates the differential, integrated differential and momentum transfer cross sections. This includes these three cross-sections for each individual process as well as the summed up cross sections.

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