Table 1 Summary of shock conditions, and SAXS analysis of the benzene reaction products.

Exp. #	P (GPa)	T (K)	d spacing [q (Å⁻¹)]	B₁	P₁	G₂	R_g2 (Å)	P₂	\(\chi_{1,2}^{1}\)	\(\chi_{1}^{2}\)
237	55 ± 5^a	4940 ± 710	3.4 Å [1.850]	0.009 ± 0.004	4.02 ± 0.14	16.3 ± 10.2	9.0^b −2.8, +1.6	4^c	2.3	5.2
239	55 ± 5	4940 ± 710	3.6 Å [1.766]	0.021 ± 0.006	3.46 ± 0.09	4.4^b −2.6, +4.4	8.1 ± 3.6	4^c	0.9	1.2
292	27 ± 4	2790 ± 455	3.4 Å [1.80]	0.005 ± 0.004	3.94 ± 0.32	1390^b −1110, +3890	38.2^b −8.8, +15.7	4^c	4.1	5.4
294	55 ± 5	4940 ± 710	3.4 Å [1.85]	0.015 ± 0.006	4.14 ± 0.21	56.2^b −39.4, +70.3	12 .1 ± 2.3	4^c	5.6	7.2
303	55 ± 5	4940 ± 710	3.4 Å [1.85]	0.019 ± 0.016	3.85 ± 0.37	−	−	−	7.4	7.7

Parameters of a 2-level unified model are presented (R_g is the radius of gyration, G is the Guinier scaling factor, B is the Porod scaling factor, and P is the Porod exponent). The goodness-of-fits (\(\chi_{1,2}^{2}\)) are compared to best fits using just a power-law and constant background (\(\chi_{1}^{2}\)). Also listed is the layer spacing of the products obtained from the low-angle XRD reflection. Estimated temperatures are the mean of those of reactant and products, with an uncertainty equal to half their difference, as described in Supplementary Note 1.
^aThe remaining shock parameters are, for the reactant: P = 27 GPa, U_s = 7.8 km/s, u_p = 4.0 km/s, and at P = 55 GPa, U_s = 10.4 km/s, u_p = 6.0 km/s. On the product Hugoniot at P = 27 GPa, U_s = 7.3 km/s, u_p = 4.2 km/s, and at P = 55 GPa, U_s = 10.0 km/s, u_p = 6.3 km/s.
^bPositive and negative parameter errors are given for asymmetric error ranges—a 2-level fit improved χ² by <10%.
^cFixed parameters.

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