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<p>The synchrotron radiation-based quasi-elastic scattering technique using multiline Mössbauer gamma rays from a nuclear Bragg monochromator is a powerful tool for investigating material dynamics on sub-nanosecond to ten-nanosecond timescales. However, the millimetre-scale beam size restricts measurements of sub-millimetre-scale samples, such as those in capillaries with diameters less than 1&#xa0;mm. In this study, we developed a quasi-elastic scattering system equipped with focusing optics to overcome this limitation and enable measurements of microscale samples. The focusing optics reduced the size of the horizontal beam to 100&#xa0;μm while maintaining the vertical size. The focusing increased the gamma-ray flux density at vertically thin samples by a factor of six, while reducing the total flux by only one third. Relaxation times measured with the focused beam agreed well with those obtained in a non-focused condition and with values given in the literature, which confirms the performance of the system. This method enables efficient investigation of nanosecond-scale dynamics in low-transmittance samples with ultrafine capillaries.</p>

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Energy-domain multiline gamma-ray quasi-elastic scattering spectroscopy using focusing optics

  • 期刊论文

  • 发表日期：

    2026年2月20日

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  • Seiya Mayuzumi,
  • Ryuta Kataoka,
  • Nobumoto Nagasawa,
  • Yoshitaka Yoda,
  • Yusuke Wakabayashi,
  • Makina Saito

摘要

The synchrotron radiation-based quasi-elastic scattering technique using multiline Mössbauer gamma rays from a nuclear Bragg monochromator is a powerful tool for investigating material dynamics on sub-nanosecond to ten-nanosecond timescales. However, the millimetre-scale beam size restricts measurements of sub-millimetre-scale samples, such as those in capillaries with diameters less than 1 mm. In this study, we developed a quasi-elastic scattering system equipped with focusing optics to overcome this limitation and enable measurements of microscale samples. The focusing optics reduced the size of the horizontal beam to 100 μm while maintaining the vertical size. The focusing increased the gamma-ray flux density at vertically thin samples by a factor of six, while reducing the total flux by only one third. Relaxation times measured with the focused beam agreed well with those obtained in a non-focused condition and with values given in the literature, which confirms the performance of the system. This method enables efficient investigation of nanosecond-scale dynamics in low-transmittance samples with ultrafine capillaries.