Article Magmas Under Pressure: Advances in High-Pressure Experiments on Structure and Properties of Melts: Synchrotron Mössbauer Spectroscopy Measurement

Mitsui, Takaya

This paper reviews recent progress of the high pressure 57Fe Mössbauer spectroscopy with a synchrotron Mössbauer source (SMS). The SMS can filter the Doppler-shifted 57Fe-Mössbauer radiation with a narrow bandwidth of nanoelectronvolt order from a broadband synchrotron radiation (SR). The focused SR beam makes it easy to measure a micron-sized sample in the diamond anvil cell (DAC), which enables the advanced Mössbauer experiments at extremely high-pressure-temperature conditions found in the Earth's core. This review consists of the following contents: introduction and outline of the conventional Mössbauer spectroscopy, the high-pressure Mössbauer measurements with a DAC, advantages and disadvantages of the time-domain 57Fe Mössbauer spectroscopy with SR, the details on the SMS based Mössbauer spectroscopy, X-ray focusing optics for high-pressure SMS spectroscopy and its advantages in applications to Earth materials. Undoubtedly, the SMS based Mössbauer spectroscopy will open up new opportunities for geophysics and planetary science.備考

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