The idea is using polar molecules to shorten the time of ionization. Molecules would align faster and the density of the plasma would be higher since electrons would have less time to scatter from the hot zone. Why not 6Li2H? http://en.wikipedia.org/wiki/Lithium_hydride
I wasn’t thinking about using heavy water to be an end of the research. Just to see if the idea is feasible, this is why I didn’t consider the Bremsstrahlung.
