in neat (no solvent) Irradiation (UV/VIS); laser ablated Zr co-deposited with H2+O2 in excess Ar onto a 10K CsI window, UV-irradiated, annealed at 22-34 K (mechanism discussed); not isolated, detected by IR;

in neat (no solvent) laser ablated Zr co-deposited with H2+(18)O2 in excess Ar onto a 10K CsIwindow, annealed at 20 K (mechanism discussed); not isolated, detected by IR;

500°C, p(H2)= 1.5-2 MPa, according to: K. N. Semenenko, V. P. Malyshev, L. A. Petrova, et al., Izv. Akad. Nauk SSSR, Neorg. Mater. 13 (1977) 2009;