Question on crafting and Skill Archaeologist

[Narrew]

I Have disassembled a few items and I thought I would be able to go back and make them, but I have the effects, but don't have the recipes to make them again. Do I need to salvage them again to get the recipe?

Also, I have an Officer with Archaeologist 2 and I wonder how is he going to help me with an artifact? I thought it was a passive ability, but still not doing well figuring out what they are? Figure that's just how it goes, just wondering if I have to go through a bunch of guesses until I hit the jackpot?

EDIT: On Officers, if I have a full compliment of 6 and am on a planet and see one that I need (right now I would love to have an engineer) would I be able to dismiss an Officer on the planet, or will I have to have a free spot available?

Thanks!