Dear Kim! I am afraid it is mistake because requied energy for chemical reaction is located in low energy spectra (0-200)^0 Сelcius degree. Under UF light illumination the photochemical reactions begin. Under x-ray radiation the global destruction of molecules starts with majority of chain unknown reactions. But with usual 2-frequency laser when their frequency emission difference is located in the vibrational spectra of molecules You really can reach some definite chemical reaction and I wish any succes on this way.
X-ray lasers were part of Reagan's star wars program- never quite worked; nevertheless, as mentioned, they may burn thru things/bring down satelites/missiles (in principle) but not so good as a catalyst. Chemical reactions happen at much lower energies.
Yes, you can. As Eugene wrote, see e.g. http://www.nature.com/nature/journal/v520/n7546/full/nature14341.html?foxtrotcallback=true
This activity is in progress at FERMI and the TIMER beamline is dedicated to four wave mixing at VUV and soft X-ray wavelengths. You may also check this link for perspectives