参量穆斯堡尔辐射源
Parametric Mössbauer radiation source
摘要：
穆斯堡尔光谱学的许多应用都与晶体中共振辐射吸收光谱的独特分辨率有关，当原子核吸收光子而没有反冲时。然而，窄的核线宽使得核的有效驱动具有挑战性，限制了精确的光谱学、核非弹性散射和核量子光学。此外，对专用X射线光学器件的需求限制了对少数同位素的访问，阻碍了更广泛类别系统的精确光谱学。在这里，我们提出了一种新的穆斯堡尔源，它提供了一个高共振光子通量的各种穆斯堡尔同位素，基于相对论电子移动通过晶体和发射参数穆斯堡尔辐射基本上不衰减的电子吸收。结果，形成共振光子的准直束，而不需要额外的单色化。我们设想的扩展高精度穆斯堡尔谱的同位素在加速器设施使用倾倒电子束。
英文摘要：
Numerous applications of Mössbauer spectroscopy are related to a unique resolution of absorption spectra of resonant radiation in crystals, when the nucleus absorbs a photon without a recoil. However, the narrow nuclear linewidth renders efficient driving of the nuclei challenging, restricting precision spectroscopy, nuclear inelastic scattering and nuclear quantum optics. Moreover, the need for dedicated X-ray optics restricts access to only few isotopes, impeding precision spectroscopy of a wider class of systems. Here, we put forward a novel Mössbauer source, which offers a high resonant photon flux for a large variety of Mössbauer isotopes, based on relativistic electrons moving through a crystal and emitting parametric Mössbauer radiation essentially unattenuated by electronic absorption. As a result, a collimated beam of resonant photons is formed, without the need for additional monochromatization. We envision the extension of high-precision Mössbauer spectroscopy to a wide range of isotopes at accelerator facilities using dumped electron beams.
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