161Dy synchrotron-radiation-based Mössbauer absorption spectroscopy.

We demonstrate a measurement system for synchrotron-radiation-based Mössbauer absorption spectra with ¹⁶¹Dy using the 25.7 keV nuclear first excited state. Mössbauer spectra of DyF₃, Dy metal and DyPc₂ (Pc = phthalocyaninato) were obtained and the parameters for the hyperfine structure of ¹⁶¹Dy nuclei in them were evaluated to demonstrate the feasibility of this method. Isomer shifts showed that Dy atoms in all of them are in trivalent state although those in Dy metal was in the region of trivalent metal region. The magnetic hyperfine field of Dy metal of 569 ± 1 T agreed with the literature of the Mössbauer experiments. That of DyPc₂ of 489 ± 1 T was reasonable because the ground state of DyPc₂ were in the state of J_z = ±13/2. Considering the highly penetrative nature of the 25.7 keV incident radiation, it will be straightforward to apply this method for the study of materials under various conditions such as high pressure, high magnetic fields, and reactive atmospheres. [ABSTRACT FROM AUTHOR]