No chemical reaction is energetic enough to emit visible light or X-rays. Yet photochemistry is trivial to obtain. We are actually doing Molecular Nuclear Fusion on the acqeous solution.
1 H2O+TU->He2++O2-+L+X-ray+E TU=turbulence above 1 W
I went to Sheffeild University, and did metalurgica lultrasound, that produces bubbles of He and O gas, while emitting X-rays at a crack in a forging.
The bset way to do Molecular Nuclear Fusion, is fire up a 50x1cm steam plasma, which at 4 atmospheres emits a constant 1.2 MW, from a volume of regular water to small to measure.
We use a pulse of electricity to start the plasma, then it self sustains.