Well seeing how demanding is exange this days i was thinking in focus particle trace farming with my dutty officers, can someone tell me where to find the best missions to get them or places? also will be helpfull name of missions.
If you critical any of the exploration/science type missions with commodity reward. Specifically look for the missions that have the 10 item reward. If you get a critical success on these, they will give particle traces in addition to the basic materials. They vary from 30m-3h for these missions. You can also get traces by critical success on the 20h artifact missions and also have a chance to get a strange alien artifact.
I have my Doffs collect data samples constantly to ensure I get a steady supply. And just go to space maps for scanning doff missions. ANY social zone space map (except Sierra system) can have them. Also the main galaxy map is a good place to look as well.