Table 1 Fitting parameters and corresponding PAL trapping modes describing positron annihilation in bulk mineral α-As4S4 and powdered β-As4S4
From: Probing Sub-atomistic Free-Volume Imperfections in Dry-Milled Nanoarsenicals with PAL Spectroscopy
Sample, fitting | Fitting parameters | PAL trapping modes | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
τ 1 | I 1 | τ 2 | I 2 | τ 3 | I 3 | τ b | κ d | τ 2 -τ b | τ 2 /τ b | |
ns | a.u. | ns | a.u. | ns | a.u. | ns | ns−1 | ns | a.u. | |
α-As4S4, ×3 | 0.193 | 0.666 | 0.346 | 0.308 | 1.873 | 0.026 | 0.224 | 0.72 | 0.12 | 1.54 |
α-As4S4, ×2 | 0.193 | 0.685 | 0.339 | 0.315 | – | – | 0.223 | 0.70 | 0.12 | 1.52 |
α-As4S4, ×2-gen. | 0.194 | 0.656 | 0.456 | 0.343 | – | – | 0.241 | 1.02 | 0.22 | 1.89 |
β-CGP, ×3 | 0.207 | 0.745 | 0.432 | 0.222 | 2.337 | 0.033 | 0.235 | 0.58 | 0.20 | 1.84 |
β-CGP, ×2 | 0.206 | 0.793 | 0.439 | 0.207 | – | – | 0.232 | 0.53 | 0.21 | 1.89 |
β-CGP, ×2-gen. | 0.208 | 0.734 | 0.656 | 0.266 | – | – | 0.254 | 0.87 | 0.40 | 2.58 |
β-FGP, ×2 | 0.193 | 0.607 | 0.344 | 0.393 | – | – | 0.233 | 0.90 | 0.11 | 1.48 |