Overall Energy Resolution (eV):
                            Calibration:
                            Au4f7 = 84.00
Charge Reference:
                            Internal hydrocarbon
Energy Scale Evaluation:
                            Reliable, with one-point correction of energy scale
Comment:
                            Calibration: the difference between the Cu2p3/2 and the Cu3s peaks was 810.1 eV. An electron flood gun was used for charge compensation. The curve-fitting procedure was made in accordance with the stoichiometry. The composition determined by XPS was C2.3O