The atomic pulverizer only deals 2 more points of damage in a shot than the alien atomizer, but has a very low AP cost of just 12 points. This puts it at the second lowest AP cost, tied with the ritual knife, and just 2 points above the toy knife. It has the same dead-on accuracy and long range of the atomizer, but lacks the raw power of a disintegrator.
It is located in the weapons lab after beaming up from the space walk section and proceeding through the observation deck. It can be found in a small room located in a hallway near the entrance. The room can only be accessed by using an alien door terminal that requires 75 Science to activate. The terminal is explosive so when killing the enemies don't destroy it. It will be found lying on a rack directly to the right after entering the door.
Other notable loot inside the same room include an offline guardian drone, a Buttercup toy, some alien power cells, another atomizer, and other forms of alien memorabilia. The official guide states that two atomic pulverizers are on the shelf, this is in fact true but with no explanation as to why there are two.