How to read particle information from a OnParticleCollision call ?

I m using particles instead of bullets and i cant figure out how to read from a script attached to the enemy,the particles initial energy which i use to store the damage output. I have max 3-4 enemies at a time and no more than 5-7 destructible environment things, so i find is just simpler to do it this way but i cant find in the documentation how to do it.