Free Volume Structure of Acrylic-Type Dental Nanocomposites Tested with Annihilating Positrons

Table 1 The best-fit PAL spectra parameters and trapping modes for DRC Charisma® determined within unconstrained x3-decomposion procedure

Sample	PAL spectra fitting parameters						Positron trapping modes				Ps-trapping modes
Sample	τ₁, ns	τ₂, ns	τ₃, ns	I₂, a.u.	I₃, a.u.	τ_av., ns	τ_b, ns	κ_d, ns⁻¹	τ₂-τ_b, ns	η, a.u.	R₃, nm	f_v ³, %
0	0.179	0.447	1.946	0.540	0.092	0.486	0.277	1.99	0.170	0.36	0.283	1.58
1	0.168	0.435	1.747	0.550	0.105	0.479	0.269	2.22	0.166	0.37	0.263	1.44
2	0.162	0.421	1.625	0.550	0.106	0.461	0.262	2.33	0.159	0.38	0.250	1.25
3	0.158	0.415	1.560	0.560	0.110	0.458	0.260	2.50	0.155	0.40	0.243	1.19