Fig. 4

Room temperature (top) and 4.2 K (bottom) Mössbauer spectra of the cut out calligraphic letters of the Latin MS (left) and the paper without letters (right). In the spectra of both samples the data points are shown as black dots; the black lines are the fits of the overall spectra. The individual spectral components are given as colored lines: the red lines are due to Fe³⁺ quadrupole doublets; the violet line in the 4.2 K spectrum of the calligraphic letters and the dark cyan lines in both spectra of the rim are due to Fe²⁺ quadrupole doublets with different quadrupole splitting values. The bright blue lines in the low temperature spectrum of the calligraphic letters originate from Fe³⁺ sites exhibiting slow paramagnetic relaxations. In the room temperature as well as in the 4.2 K spectrum of the rim there is a well-pronounced Fe³⁺ sextet originating from magnetic hyperfine splitting