Table 2. EXAFS fit results for yellow clusters extracted from Villard soil.

Sample	shell	N	R(Å)	σ2(Å2)
Villard cluster	U-Oax	2*	1.787(0.006)	0.006(0.001)
	U-Oeq	3.468(0.255)	2.241(0.005)	0.006(0.001)
	U-P	3.190(1.493)	3.673(0.117)	0.030(0.019)
	MS1	8*	3.725(0.048)	0.001(0.001)
	MS2	4*	3.810*	0.003*
	U	5*	5.061(0.184)	0.027(0.031)
m-autunitea	U-Oax	2	1.774(0.006)	0.003(0.001)
	U-Oeq	4	2.277(0.006)	0.004(0.001)
	U-P	4	3.59(0.002)	0.005(0.001)
	MS1	8	3.71(0.002)	0.002(0.002)
	MS2	4	3.81*	0.003*
	U	4	5.210(0.110)	0.014(0.007)

N: coordination number, R: radial distance, σ²: Debye-Waller factor. ΔE0 was estimated at 5.733(0.834) for the whole set of shells, and R-factor was 0.027 for the fit of Villard cluster spectrum. The estimated standard deviations are listed in parenthesis.

*: parameter fixed during fitting. MS1: U-Oeq-P multiple scattering path, MS2: U-Oeq-P-Oeq multiple scattering path.

^aData published in [32].