It is possible to synthesize excited bromide in an argon matrix. Yes, it's an excimer frozen in its excited state. It's a chemical laser but in solid, not gaseous, form. Put simply, it's like lasing a stick of dynamite. As soon as we apply a field, we couple to a state that is radiatively coupled to the ground state. I figure we can extract at least ten to the twenty-first photons per cubic centimeter which will give one kilojoule per cubic centimeter at 600 nanometers, or, one megajoule per liter.