Fusion of the isotopes of hydrogen

[Vectronix]

Hi

I assume that two hydrogen atoms fuse together to form one helium atom during nuclear fusion. But what happens when other isotopes of hydrogen fuse together? What happens to two deuterium atoms when they fuse together? Tritium? I'm assuming that they would form an isotope of helium, but which isotope, if there are more than one (I can't remember), and if the helium isotope it forms does not have more than two neutrons, what happens to the other two (or three?) neutrons and what else is released during the reaction (energy, forces, other particles if any)?

 

[Vagn]

Two H+ atoms will fuse to for Deuterium, emiting a positron and a neutrino as one proton becomes a neutron. Deuterium then fuses with a hydrogen nucleus to form Helium-3 usually, which can then fuse with another Helium-3 nucleus to form Helium 4 and the emission of two protons.

http://en.wikipedia.org/wiki/Proton-proton_chain

When 2 deuterium atoms fuse, they become a Helium-4 nucleus.
http://en.wikipedia.org/wiki/Deuterium_burning