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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/61493

    Title: 莫斯堡光譜儀的建造以及其應用到FeCO3薄膜的診斷;Development of M?ssbauer spectrometer and it’s application to characterization of FeCO3 film
    Authors: 魏敏生;Wei,Min-sheng
    Contributors: 物理學系
    Keywords: 莫斯堡光譜;晶體診斷;梅氏堡光譜;穆斯堡爾光譜;碳酸亞鐵;M?ssbauer spectrometer;crystal characterization;meterial characterization;FeCO3;siderite;iron carbonate
    Date: 2013-08-12
    Issue Date: 2013-10-08 15:15:38 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 為了在核子量子光學(nuclear quantum optics)的領域中發展EIT(electromagnetically induced transparency)效應的研究,首要目標為達成nuclear level crossing。目前研究瓶頸為難以取得高純度的FeCO3(siderite)晶體,以致雜質破壞晶體的結構,使得level anti-crossing的現象出現。為了可以詳細研究 nuclear level crossing 及 nuclear level anti-crossing 的性質,必須能自由的控制晶體中Ca或是Mg的濃度以控制磁場及c-axis、EFG的方向。故發展人工製作FeCO3晶體的技術以及晶體診斷技術是必要的。

    To demonstrate the electromagnetically induced transparency in gamma rays region at the single photon level via the level crossing and level anti-crossing technique. The difficulty of obtaining pure FeCO3(siderite) single crystal is the bottleneck in the experiment. Impurity in the crystal will break structure of crystal, making level crossing phenomenon unable to achieve. For the sake of further study of nuclear level crossing and nuclear level anti-crossing, we have to adjust the concentration of CaCO3 and MgCO3 in siderite crystal for controlling the direction between magnetic hyperfine field and c-axis and EFG in the crystal. Hence the necessity for developing the method of FeCO3 crystal growth and crystal characterization is obvious.

    The main achievement of this thesis is develop a fully developed M?ssbauer spectrometer and a platform for crystal characterization. By a series of improvement on hardware and software, we can push up the signal to noise ratio of M?ssbauer spectrum to the theoretical limit. And setup a cryostat system for future experiment. The source code of signal to noise evaluation program and data processing program will attach as an appendix. Finally, the FeCO3 thin film were used for testing the performance of spectrometer, then characterize the sample by experimental data and the theoretical explanation.
    Appears in Collections:[物理研究所] 博碩士論文

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