Development of High Efficiency High Resolution Cryogenic Detector for X-ray Fluorescence Applications and Student Training

用于 X 射线荧光应用和学生培训的高效高分辨率低温探测器的开发

基本信息

  • 批准号:
    0114216
  • 负责人:
  • 金额:
    $ 25万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Continuing Grant
  • 财政年份:
    2001
  • 资助国家:
    美国
  • 起止时间:
    2001-09-01 至 2005-07-31
  • 项目状态:
    已结题

项目摘要

X-ray detection is often the limiting factor in modern synchrotron-based fluorescence experiments in material science and biophysics. The brightness available from synchrotron radiation sources has increased by nearly 10 orders of magnitude in the past 20 years, but our ability to collect and discriminate emitted x-rays has not kept pace. This award from the Instrumentation for Materials Research program to the University of California Davis will support new detector development which will greatly enhance the sensitivity of existing instrumentation for fluorescence analysis of thin films or dilute samples in material science and biophysics. This instrument development will adapt existing cryogenic detectors to the specific needs of synchrotron experiments. The origin of the spectral artifacts that presently limit the sensitivity to certain emission lines will be studied and addressed. The current detector's usable energy range will be extended beyond one kilo electronvolt by adding thick absorber films of high Z materials. The total area and count rate capabilities of the sensor will be increased by increasing This development will be done by graduate students and postdoctoral fellows in collaboration with the Advanced Detector Group at Lawrence Livermore. The cryogenic spectrometer will be available to collaborators on a proposal basis. Combining such high-sensitivity high-resolution detectors with the intensity of undulator radiation of third generation synchrotrons will open up a range of new experimental methods for previously unfeasible science. Graduate students will focus on two sets of experiments. They will develop angle-resolved soft x-ray fluorescence spectroscopy for non-destructive depth profiling of thin film samples. They will also extend fluorescence-detected L-edge absorption spectroscopy to vanadium and manganese-containing metalloenzymes to determine the chemical oxidation state of the metal site during the catalytic cycle. The long-term goal is to combine non-destructive depth profiling and in-situ chemical characterization of samples with part per million level sensitivity.X-ray detection is often the limiting factor in modern synchrotron-based fluorescence experiments in material science and biophysics. The brightness available from synchrotron radiation sources has increased by nearly 10 orders of magnitude in the past 20 years, but our ability to collect and discriminate emitted x-rays has not kept pace. This award from the Instrumentation for Materials Research program to the University of California Davis will support new detector development which will greatly enhance the sensitivity of existing instrumentation for fluorescence analysis of thin films or dilute samples in material science and biophysics. This instrument development will adapt existing cryogenic detectors to the specific needs of synchrotron experiments. The development will be done by graduate students and postdoctoral fellows in collaboration with the Advanced Detector Group at Lawrence Livermore. The cryogenic spectrometer will be available to collaborators on a proposal basis. Combining such high-sensitivity high-resolution detectors with the intensity of undulator radiation of third generation synchrotrons will open up a range of new experimental methods for previously unfeasible science. Graduate students will focus on two sets of experiments. The long-term goal is to combine non-destructive depth profiling and in-situ chemical characterization of samples with part per million level sensitivity.
X 射线检测通常是材料科学和生物物理学中基于同步加速器的现代荧光实验的限制因素。过去 20 年来,同步加速器辐射源的亮度增加了近 10 个数量级,但我们收集和辨别发射的 X 射线的能力却没有跟上。加州大学戴维斯分校材料研究仪器项目授予的这一奖项将支持新探测器的开发,这将大大提高材料科学和生物物理学中薄膜或稀释样品荧光分析现有仪器的灵敏度。该仪器的开发将使现有的低温探测器适应同步加速器实验的特定需求。目前限制某些发射线灵敏度的光谱伪影的起源将得到研究和解决。通过添加高 Z 材料的厚吸收膜,电流探测器的可用能量范围将扩展到超过 1 千电子伏。传感器的总面积和计数能力将通过增加而增加。这项开发将由研究生和博士后研究员与劳伦斯利弗莫尔的高级探测器小组合作完成。低温光谱仪将根据提案提供给合作者。将这种高灵敏度高分辨率探测器与第三代同步加速器的波荡器辐射强度相结合将为以前不可行的科学开辟一系列新的实验方法。研究生将重点进行两组实验。他们将开发角度分辨软 X 射线荧光光谱,用于薄膜样品的无损深度分析。他们还将荧光检测的 L 边吸收光谱扩展到含钒和锰的金属酶,以确定催化循环期间金属位点的化学氧化态。长期目标是将无损深度分析和样品的原位化学表征与百万分之一级的灵敏度结合起来。X射线检测通常是材料科学和生物物理学中基于同步加速器的现代荧光实验的限制因素。过去 20 年来,同步加速器辐射源的亮度增加了近 10 个数量级,但我们收集和辨别发射的 X 射线的能力却没有跟上。加州大学戴维斯分校材料研究仪器项目授予的这一奖项将支持新探测器的开发,这将大大提高材料科学和生物物理学中薄膜或稀释样品荧光分析现有仪器的灵敏度。该仪器的开发将使现有的低温探测器适应同步加速器实验的特定需求。该开发将由研究生和博士后研究员与劳伦斯利弗莫尔的高级探测器小组合作完成。低温光谱仪将根据提案提供给合作者。将这种高灵敏度高分辨率探测器与第三代同步加速器的波荡器辐射强度相结合将为以前不可行的科学开辟一系列新的实验方法。研究生将重点进行两组实验。长期目标是将无损深度分析和样品的原位化学表征与百万分之一级的灵敏度结合起来。

项目成果

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Stephen Cramer其他文献

Resonance enhanced coherent anti-Stokes Raman scattering.
共振增强相干反斯托克斯拉曼散射。

Stephen Cramer的其他文献

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{{ truncateString('Stephen Cramer', 18)}}的其他基金

Quantitative Molecular Dynamics of Extremophile Metalloproteins -- Combining Experiment and Computation
极端微生物金属蛋白的定量分子动力学——实验与计算相结合
  • 批准号:
    2149122
  • 财政年份:
    2022
  • 资助金额:
    $ 25万
  • 项目类别:
    Standard Grant
Meeting: 19th International Congress on Nitrogen Fixation to be held in Pacific Grove, California from October 4-9, 2015
会议:第十九届国际固氮大会将于 2015 年 10 月 4 日至 9 日在加利福尼亚州太平洋丛林举行
  • 批准号:
    1541289
  • 财政年份:
    2015
  • 资助金额:
    $ 25万
  • 项目类别:
    Standard Grant
Spectroscopy of Early Intermediates in Nitrogenase Catalysis - From Steady State to Femtoseconds
固氮酶催化早期中间体的光谱学 - 从稳态到飞秒
  • 批准号:
    1308384
  • 财政年份:
    2013
  • 资助金额:
    $ 25万
  • 项目类别:
    Standard Grant
Time Resoved Vibration Spectrocopy of Functioning Substrate-Bound Nitrogenase
功能性底物结合固氮酶的时间分辨振动光谱
  • 批准号:
    0745353
  • 财政年份:
    2008
  • 资助金额:
    $ 25万
  • 项目类别:
    Standard Grant
X-Ray Resonance Raman Spectroscopy of Mn and Ni Metalloproteins
锰和镍金属蛋白的 X 射线共振拉曼光谱
  • 批准号:
    0213592
  • 财政年份:
    2002
  • 资助金额:
    $ 25万
  • 项目类别:
    Continuing Grant
A Fast-Cycling Magnet, 3He Cryostat Instrument for Spin- Polarized EXAFS and X-Ray MCD
用于自旋偏振 EXAFS 和 X 射线 MCD 的快速循环磁体 3He 低温恒温器仪器
  • 批准号:
    9317942
  • 财政年份:
    1994
  • 资助金额:
    $ 25万
  • 项目类别:
    Standard Grant
Soft X-ray Magnetic Circular Dichroism of Metalloproteins
金属蛋白的软X射线磁圆二色性
  • 批准号:
    9107312
  • 财政年份:
    1992
  • 资助金额:
    $ 25万
  • 项目类别:
    Continuing Grant
Instrument Development For X-ray Magnetic Circular Dichroism
X射线磁圆二色性仪器的研制
  • 批准号:
    9105323
  • 财政年份:
    1991
  • 资助金额:
    $ 25万
  • 项目类别:
    Continuing Grant

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