“…3B . It is clear that the bands assignable to methoxy species emerge at 2980 and 2876 cm –1 , and 2973 and 2868 cm –1 , 8 , 23 , 27 , 30 which imply the occurrence of at least two types of methoxy species. This observation is consistent with our earlier INS and DRIFTS data that show two types of methoxy species 29 , 30 and is in line with earlier infrared and NMR reports.…”