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Table 2 Mössbauer parameters obtained at room temperature and 4.2 K for the studied historical documents

From: Mössbauer study of iron gall inks on historical documents

Material and assignment Room temperature spectrum 4.2 K spectrum
  IS [mm/s] QS [mm/s] B [T] W [mm/s] A [%] IS [mm/s] QS [mm/s] B [T] W [mm/s] A [%]
Chancery MS part with writing
Iron oxalate 1.09(1) 1.73(1) 0.28(1) 42(2) 1.08(1) − 1.96(4) 15.3(1) 0.57(1) 42(1)
Hydronium jarosite 0.27(1) 1.24(1) 0.26(1) 17(2) 0.26(1) − 0.18(1) 47.8(2) 0.82(2) 22(1)
Ferric iron doublet 0.27(1) 0.84(2) 0.67(2) 41(2) 0.33(2) 0.79(2) 0.97(7) 23(1)
Ferric iron sextet       0.28(2) 0.05(3) 53.8(2) 0.58(4) 5(1)
Ferrous iron doublet       1.15 2.75(3) 0.69(4) 8(1)
Chancery MS paper without ink
Ferric iron doublet 1 0.14(2) 0.55(4) 0.51(6) 51(7) 0.25(2) 0.82(3) 0,57(4) 50(3)
Ferric iron doublet 2 0.24(2) 1.08(3) 0.38(4) 35(7)      
Ferric iron goethite       0.26 − 0.22(8) 49.1 0.25* 41(3)
Ferrous iron doublet 1.0 1.87(12) 0.75 14(3) 0.94(13) 3.6(3) 0.75 9(2)
Latin MS letters with little paper
Ferric iron 0.28(1) 0.79(1) 0.51(1) 100 0.28(1) 0.81(1) 0.61(1) 59(1)
Ferric iron       0.29(1) 0.10(1) 52.1(5) 0.25* 6(1)
Ferric iron       0.26 0.0 26(1) 0.25* 34(3)
Ferrous iron       1.16 2.60 0.25* 1.1(5)
Latin MS paper without ink
Ferric iron doublet 0.22(2) 0.77(3) 0.64(3) 66(2) 0.27(1) 0.77(1) 0.72(2) 52(2)
Hematite 0.25(2) − 0.25(4) 50.6(2) 0.54(8) 20(2) 0.26 − 0.11(3) 53.3(2) 0.47(8) 15(5)
Ferric iron(goethite)       0.26(1) − 0.18(3) 49.7(5) 0.25* 23(5)
Ferrous iron 1.14(9) 2.52(20) 0.77(12) 14(2) 0.98(3) 2.85(6) 0.50 10(2)
Cookbook pages 50–70
Ferric iron 0.26(1) 0.75(1) 0.49(1) 100 Not measured
Cookbook single page cut
Ferric iron 0.27(1) 0.77(1) 0.45(1) 100 0.28(1) 0.80(1) 0.56(1) 34(1)
Ferric iron (lepidocrocite)       0.25(1) − 0.16(1) 45.0(1) 0.25 29(1)
Ferric iron       0.26 0 52 0.25* 4(1)
Ferric iron       0.26 0 32(1) 0.25* 32(2)
Ferrous iron       1.01(3) 2.87(6)   1(1)
Cookbook paper only
Ferric iron 0.12(3) 0.70(3) 0.63(4) 100 0.22(3) 0.88(5)   0.42(7) 52(6)
Ferric iron       0.26 0.21(1) 51.0(6) 0.25* 48(6)
Iron oxalate
Ferrous iron 1.09(1) 1.74(1) 0.25(1) 100 1.09(1) − 1.94(1) 14.9(1) 0.27(1) 100
Hydronium Jarosite
Ferric iron 0.27(1) 1.25(1) 0.29(1) 89(1) 0.24(1) − 0.13(1) 48.5(2) 0.38(2) 78(1)
Ferrous iron 1.17(3) 2.27(3) 0.55(5) 11(1) 1.14(1) 3.14(2) 0.25 22(1)
  1. IS is the isomer shift relative to the 57Co:Rh source having the same temperature as the absorber. QS = eQVzz/2 · (1 + η2/3)1/2 is the electric quadrupole interaction, B is the magnetic hyperfine field at the iron nuclei, W is the full width at half maximum of the Mössbauer lines and A is the relative area of the individual components in the Mössbauer spectrum. Values in parentheses are the last digit errors. When no error is given, the value was fixed during the fit. Components that cannot be identified with specific iron compounds are designated merely as ferric or ferrous iron. In some cases, magnetically split components were fitted with a Gaussian distribution of hyperfine fields. This is indicated by an asterisk behind the value of the Lorentzian line-width used for the distribution. More details of this are given in the text