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非弹性中子散射谱是材料科学和物理学研究中的关键工具, 其通过观测中子与物质相互作用后的能量和动量变化, 揭示材料的微观动力学特性. 该技术为定量描述材料的声子色散和磁性激发提供了重要信息. 非弹性中子散射谱仪根据单色中子的选择方法, 可分为三轴谱仪和飞行时间谱仪. 三轴谱仪具有高信噪比、高灵活性, 并且对特定测量点能进行精确追踪; 而飞行时间谱仪则通过多种手段显著提升实验效率. 非弹性中子散射谱仪的应用范围相当广泛, 在磁性、超导、热电、催化等诸多材料的机理研究方面, 均体现出在推动前沿科学发展中的不可或缺性. 中国散裂中子源的高能非弹性谱仪是国内首台飞行时间中子非弹性谱仪, 凭借其创新的费米斩波器设计, 成功实现了高分辨率与多能量的共存, 同时实验可用的单束中子支数达到了国际领先水平.
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关键词:
- 非弹性中子散射 /
- 三轴中子散射谱仪 /
- 飞行时间中子散射谱仪 /
- 费米斩波器
Inelastic neutron scattering is a pivotal technique in materials science and physics research, revealing the microscopic dynamic properties of materials by observing the changes in energy and momentum of neutrons interacting with matter. This technique provides important information for quantitatively describing the phonon dispersion and magnetic excitation of materials. Inelastic neutron scattering spectrometers can be divided into triple-axis spectrometers and time-of-flight spectrometers, according to the method of selecting monochromatic neutrons. The former has high signal-to-noise ratio, flexibility, and precise tracking capabilities for specific measurement points, while the latter significantly improves experimental efficiency through various measures. The application of inelastic neutron scattering spectrometers is quite extensive, playing an indispensable role in advancing frontier scientific research in the study of mechanisms in various materials such as magnetism, superconductivity, thermoelectrics, and catalysis. The high-energy inelastic spectrometer at the China Spallation Neutron Source is the first time-of-flight neutron inelastic spectrometer in China, achieving high resolution and multi-energy coexistence with its innovative Fermi chopper design. Additionally, the number of available single neutron beams in the experiment of this facility has reached the international leading level.-
Keywords:
- inelastic neutron scattering /
- triple-axis neutron scattering spectrometer /
- time-of-flight neutron scattering spectrometer /
- Fermi chopper
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图 1 (a)三轴谱仪平面图; (b) CMRR的“鲲鹏”冷三轴谱仪[30]; (c) “翠竹”热中子谱仪的构造图[31]; (d) “翠竹”热中子谱仪的照片[29]
Fig. 1. (a) Triple-axis spectrometer plane diagram; (b) the cold triple-axis spectrometer “Kunpeng” at CMRR[30]; (c) construction diagram of the thermal triple-axis spectrometer IOP-CIAE[31]; (d) photograph of the thermal triple-axis spectrometer IOP-CIAE[29].
图 2 直接几何飞行时间谱仪的构造图
Fig. 2. Construction diagram of a direct geometry time-of-flight spectrometer.
图 4 费米斩波器的构造 (a) Sloppy斩波器; (b)钆斩波器
Fig. 4. Construction of the Fermi chopper: (a) Sloppy chopper; (b) Gd chopper.
图 5 通过费米斩波器的中子飞行时间-距离图. 其中虚线表示相邻两支单色中子的能量分析区间存在重叠. 颜色的透明度代表费米斩波器在该能量的透过率
Fig. 5. The neutron flight time-distance diagram of the Fermi chopper. The dashed lines indicate that there is an overlap in the energy analysis ranges of two adjacent monochromatic neutrons. Transparency of the colors represents the transmission rate of the Fermi chopper at that energy.
图 6 费米斩波器不同转速下能量分辨率随波长的变化. 其中红色区域为RRM模式禁区
Fig. 6. Energy resolution of the Fermi chopper varies with wavelength at different rotation speeds. The red area indicates the forbidden zone for the RRM mode.
图 7 使用弯通道费米斩波器的中子飞行时间图
Fig. 7. The neutron time-of-flight diagram with a curved channel Fermi chopper.
图 8 SnS声子色散和动态磁化率$ (\chi''(Q, E)) $随结构相变的演化 (a)—(d) Pnma相; (e)—(h) Cmcm相. 图(a)和图(e)分别为在Pnma相和Cmcm相中用谐波近似计算的低能色散[50]
Fig. 8. The SnS phonon dispersion and dynamic magnetic susceptibility $ (\chi''(Q, E)) $ evolve with structural phase transitions: (a)–(d) The Pnma phase; (e)–(h) the Cmcm phase. The low-energy dispersion calculated using harmonic approximation in the Pnma phase and Cmcm phase are shown[50] in panels (a) and (e).
图 9 (a)通过非弹性中子散射测量$ {\mathrm{La}}_3 {\mathrm{Ni}}_2 {\mathrm{O}}_{7-\delta} $的能谱, 强度为低温减去高温数据; (b)通过自旋波计算得到的自旋激发谱[54]
Fig. 9. (a) Energy spectrum of ${\mathrm{La}}_3{\mathrm{Ni}} _2{\mathrm{O}} _{7-\delta} $ was measured through inelastic neutron scattering, with intensity being the low-temperature data subtracted from the high-temperature data; (b) spin excitation spectrum obtained through spin wave calculations[54].
图 10 (a)通过非弹性中子散射测量的$ {\mathrm{PbCuTe}}_2{\mathrm{O}} _6 $粉末的磁激发; (b)$ {\mathrm{PbCuTe}}_2{\mathrm{ O}}_6 $单晶的磁激发谱[72]
Fig. 10. (a) Magnetic excitations of ${\mathrm{PbCuTe}} _2{\mathrm{O}} _6 $ powder measured by inelastic neutron scattering; (b) magnetic excitation spectrum of $ {\mathrm{PbCuTe}}_2{\mathrm{O}} _6 $ single crystal[72].
表 1 各个非弹谱仪的参数对比. 其中L1, L2和L3分别为慢化器到费米斩波器的距离、样品到费米斩波器的距离和样品到探测器的距离
Table 1. Parameter comparison of various non-elastic spectrometers. Among them, L1, L2 and L3 are the distance from the moderator to the Fermi chopper, the distance from the sample to the Fermi chopper and the distance from the sample to the detector respectively.
谱仪 HRC 4SEASONS SEQUOIA ARCS MERLIN HD 中子源 J-PARC J-PARC SNS SNS ISIS CSNS 慢化器 DHM CHM DWM DWM DWM DWM Ei/meV 1—2000 5—300 8—2000 10—1500 7—2000 10—1500 Q/Å–1 — — — 0.15—22 — 0.1—41.5 水平角度 –31°—62° –35°—130° –30°—60° –28°—135° –45°—135° –30—130°
前期(–30°—60°)垂直角度 20°—20° –25°—27° –18°—18° –27°—26° –30°—30° –30—30° 分辨率 >2% >5% 1%—5% 3%—5% 4%—7% 3%—10% L1/L2/L3 14/1/4 16.3/1.7/2.5 18/2/5.53 11.6/2/3—3.4 10/1.8/2.5 16/2/2.5 样品尺寸 5 cm×5 cm 4.5 cm×4.5 cm
or 2 cm×2 cm5 cm×5 cm 5 cm×5 cm 5 cm×5 cm 5 cm×5 cm
or 3 cm×3 cm
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