Emission Mössbauer spectroscopy in the Co–O system under high oxygen pressure

7-W single-mode thulium-doped fibre laser pumped at 1230 nm

“…The branching ratio was adopted as b R = 0.875, and two source matrices have been considered: Rh with d s = 10 µm and CoO with d s = 40 µm. The non-stoichiometry of the latter matrix has been neglected, as it is small for all available thermodynamic conditions [7]. It has been assumed that the radiation filter is made of graphite having d F = 1 mm and is kept at ambient temperature.…”

“…In order to study the behaviour of extremely diluted impurities one has to resort to emission Mössbauer spectroscopy [5][6][7]. In such a case, one investigates the Mössbauer level formed in the source due to the decay of the parent nucleus.…”

“…Sources in the form of single crystals yield the most complete information [2]. Usually thin sources are used including thickness for the resonant selfabsorption [7], i.e., sources highly transparent to the emitted radiation including recoilless photons. Investigations are generally performed at high temperatures and under specific thermodynamic conditions, e.g.…”

“…Investigations are generally performed at high temperatures and under specific thermodynamic conditions, e.g. under controlled atmosphere surrounding the sample under investigation [7]. In most cases the emission line is composed of a single, albeit broadened Lorentzian line, and the emitted radiation can be considered as unpolarized.…”

Nucleogenic iron studied by emission Mössbauer spectroscopy in Co-metal

“…Details of the sample preparation procedure can be found elsewhere [6,7]. The uniform distribution of the 57 Co activity in the sample under investigation corresponded to the concentration of the radioactive cobalt and nucleogenic iron at the level of 40-at.…”