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首页> 外文期刊>Journal of Experimental and Theoretical Physics >Mossbauer Optics of Synchrotron Radiation at an Isotopic Boundary
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Mossbauer Optics of Synchrotron Radiation at an Isotopic Boundary

机译：同位素边界上同步辐射的莫斯鲍尔光学

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The inelastic coherent Mossbauer scattering (ICMS) of synchrotron radiation at an isotopic boundary-a flat interface between two regions of matter which have different concentrations of the Mossbauer isotope-is investigated theoretically. Attention is focused primarily on the ICMS component for which the absorption of a synchrotron radiation photon by a nucleus occurs with recoil, i. e., with the creation or annihilation of lattice phonons, and the subsequent process of reemission of a photon by the Mossbauer nucleus occurs without recoil, as a result of which radiation is pumped from the wide synchrotron radiation line into the narrow Mossbauer line. Formulas similar to the Fresnel formulas, well known in optics, for the transmission and reflection of light at a dielectric boundary are obtained for ICMS at an isotopic boundary. Specifically, it is shown that the angle of reflection for ICMS at an isotopic boundary is different from the angle of mirror reflection of a synchrotron radiation beam, and the direction of the ICMS transmitted through the isotopic boundary depends on the deviation of its frequency from the exact value of the Mossbauer resonance frequency and in general is different from the direction of propagation of the synchrotron radiation beam. The suppression of ICMS at grazing angles of incidence of the synchrotron radiation beam is analyzed. A similar problem is solved for a plate-shaped sample containing a Mossbauer isotope. It is shown that the specific nature of the ICMS at an isotopic boundary could be helpful in the problem of Mossbauer filtering of synchrotron radiation.
机译：理论上研究了在同位素边界（物质浓度不同的两个物质区域之间的平坦界面）处的同步加速器辐射的非弹性相干Mossbauer散射（ICMS）。注意主要集中在ICMS组件上，对于该组件，原子核吸收同步加速器辐射光子时会产生反冲，即。例如，随着晶格声子的产生或an灭，随后发生的莫斯鲍尔核子释放光子的过程没有后坐力，其结果是辐射从宽的同步加速器辐射线泵入狭窄的莫斯鲍尔线。对于同位素边界处的ICMS，获得了与光学中众所周知的菲涅耳公式相似的公式，用于在介电边界处透射和反射光。具体而言，表明了ICMS在同位素边界处的反射角与同步辐射束的镜面反射角不同，并且ICMS透过同位素边界的方向取决于其频率与频率的偏离。 Mossbauer共振频率的精确值通常与同步加速器辐射束的传播方向不同。分析了在同步辐射束入射掠入射角下ICMS的抑制。对于包含莫斯鲍尔同位素的板状样品，解决了类似的问题。结果表明，在同位素边界处的ICMS的特殊性质可能有助于解决同步加速器辐射的Mossbauer滤波问题。

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