四、 1. Please give the step-by-step reaction mechanism of water gas shift reaction using Ru(bpy)2Cl2 as a homogeneous catalyst.

(b)Briefly explain the information provided by its photoelectron spectrum of CO including the. meaning of fine structure of photoelectron spectrum in terms of bonding and antibonding characters as well as the difference of the intensity in terms of overlapping of vibrational wavefunction