Megaman1051
I know it has been some time since your post, but you have not updated your post with a success, so I have assumed you have not had one yet. I have been successful in creating Atomic Science Dark matter. Mine is a Minecraft 1.6.4 server, and is running the current recommended Tekkit 1.2.9e under the Technic launcher Atomic Science Ver. 1.2.0.63. My Dark matter rig is extremely rough draft. At my first success, and at current it is a particle accelerator pattern 83 blocks X 23 blocks that accelerates the particle to just over 60% in one lap, and the particle destabilizes just after two laps, I guesstimate because the 23 block side is not long enough to support those speeds. I have inserted two particle accelerators into a corner, one going one direction the other the other, and turn on one particle accelerator till its particle reaches >50% speed (Dash16 correctly states rules governing the topic in fore mentioned post with one exception, only one particle has to attain speeds >50% through no fault of his own, he only quoted the official website), then I switch on the opposite directed particle accelerator, and then they collide with only one particle having attained speeds >50%. The other particle speed is not of consequence. However If you do have two particles at speeds >50% instead of just one particle at time of impact, I would imagine it would take your chances from 5% to 10% success at attaining Dark Matter upon successful impact. I had 5% chance with my rig giving me at most 20 attempts before successfully attaining Dark Matter from collision, I scored in 4 attempts, and the Dark Matter does end up in the particle accelerator block in the antimatter slot, and not as a pick up on the ground in my case. Both particle accelerators share just 50 RF from the hardened energy cell between them.
I hope this helps, here are some pics. I will try to make a youtube video on the subject, as I have found no other media anywhere into the topic as of yet.
P.S. The only difference b/w atomic electromagnet, electromagnet, and electromagnet glass besides the obvious cost, and transparency is that atomic electromagnets do not break after explosions made at random particle collisions. This might cause you to spend the extra cost so your rig doesn't blow. I have used every electromagnet block and they all seem to be interchangeable in every aspect of my rig except that fact.