Table 2.

Best-fit EXAFS parameters for Pd1Cu5-Y.

	Scattering pair	Na	R(Å)b	σ2(Å2)c	∆E(eV)d	R-factore
Cu K-edge
As-prepared	Cu-O	4.5 (0.2)	1.94 (0.004)	0.006 (0.001)	1.0 (0.6)	0.002
Pre-treated (378 K, O2)	Cu-O	4.4 (0.2)	1.94 (0.004)	0.006 (0.001)	3.1 (0.9)	0.004
Wacker-equilibrated (4 hr)	Cu-O	4.2 (0.2)	1.95 (0.004)	0.006 (0.001)	1.3 (0.5)	0.001
Low pO2, 60 min	Cu-O	3.8 (0.1)	1.94 (0.004)	0.007 (0.001)	0.8 (0.6)	0.002
High pO2, 60 min	Cu-O	4.2 (0.1)	1.94 (0.004)	0.007 (0.001)	0.8 (0.5)	0.001
Pd K-edge
As-prepared	Pd-O/N	3.6 (0.2)	2.01 (0.01)	0.003 (0.001)	3.1 (1.0)	0.009
Pre-treated (378 K, O2)	Pd-O/N	3.5 (0.2)	2.01 (0.01)	0.004 (0.001)	8.5 (1.3)	0.010
Wacker-equilibrated (4 hr)	Pd-O/N	3.1 (0.3)	2.01 (0.01)	0.004 (0.001)	2.5 (1.5)	0.009
	Pd-Pd	1.5 (0.9)	2.76 (0.05)	0.018 (0.003)	7.9 (2.5)
Low pO2, 60 min	Pd-O/N	2.6 (0.4)	2.01 (0.01)	0.005 (0.003)	2.9 (1.9)	0.014
	Pd-Pd	1.5 (1.0)	2.78 (0.07)	0.015 (0.009)	2.8 (2.0)
High pO2, 60 min	Pd-O/N	2.9 (0.3)	2.01 (0.01)	0.006 (0.003)	3.0 (2.0)	0.047
	Pd-Pd	1.4 (1.0)	2.78 (0.07)	0.014 (0.010)	3.9 (2.2)

EXAFS extended X-ray absorption fine structure, standard errors in brackets.

^aNumber of nearest neighbors determined by fixing the amplitude reduction factor (${\mathit{S}}_0^2$) values obtained from the fits to Cu (${\mathit{S}}_0^2$ = 0.82) and Pd (${\mathit{S}}_0^2$ = 0.86) foil reference spectra.

^bInteratomic distance.

^cPseudo Debye-Waller factor.

^dShift of the energy threshold.

^eR-factor: goodness of fit between experimental and theoretical data.