Table 1 The peak positions and Stark tuning rates of CO^* on Pt, Pd, Au, and OD-Cu, respectively.

	Pt	Pd		Au	OD-Cu
	CO_atop	CO_atop	CO_bridge	CO_atop	CO_atop	CO_bridge
SEIRAS	2084−2067 cm⁻¹	2082−2053 cm⁻¹	1973−1948 cm⁻¹	2114−2090 cm⁻¹	2078−2060 cm⁻¹	1850–1903 cm⁻¹
	(0.6 to 0 V)	(0.8 to 0 V)	(0.8 to 0 V)	(0.7 to 0.3 V)	(−0.2 to −0.7 V)	(−0.1 to 0.4 V)
	29 cm⁻¹/V	35 cm⁻¹/V	32 cm⁻¹/V	57 cm⁻¹/V	36 cm⁻¹/V	109 cm⁻¹/V
SERS	2084−2071 cm⁻¹	2082−2055 cm⁻¹	1972−1947 cm⁻¹	2134−2122 cm⁻¹	2095−2087 cm⁻¹	1894–1930 cm⁻¹
	(0.6 to 0 V)	(0.8 to 0 V)	(0.8 to 0 V)	(0.8 to 0.2 V)	(0 to −0.4 V)	(−0.1 to 0.4 V)
	21 cm⁻¹/V	35 cm⁻¹/V	32 cm⁻¹/V	19 cm⁻¹/V	19 cm⁻¹/V	69 cm⁻¹/V

All the potentials are on the RHE scale. The potential ranges in which CO peak intensities are greater than 60% of the maximum are selected to determine the Stark tuning rates.

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