Häussler Wolfgang, Schmidt Ulrich
Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156, 38042 Grenoble Cedex 9, France.
Phys Chem Chem Phys. 2005 Mar 21;7(6):1245-9. doi: 10.1039/b419281h.
In contrast to other inelastic neutron scattering methods, neutron spin echo (NSE, F. Mezei, Z. Phys., 1972, 255, 146) tests sample dynamics directly in the time domain. The corresponding energy resolution is the highest one of all neutron scattering methods. In NSE, the spin phase accumulated in magnetic fields before and after the sample is compared. The Neutron Resonance Spin Echo (NRSE) technique (R. Gähler and R. Golub, Z. Phys. B, 1987, 65, 269) relies on a similar principle as NSE. Using additional RF frequency coils allows a significant reduction of the dimensions of the static magnetic field coils. The dynamic range both in NSE and NRSE is restricted to three orders of magnitude, at most. The tuning of an NRSE instrument is, moreover, restricted to few resonance frequencies, predetermined by electrical conditions. In order to increase the flexibility of NSE instruments, and to enable studies of dynamics spread over a wider range of the spin echo time, we combined both methods, NSE and NRSE, in a single setup. A test experiment with the new NSE-NRSE setup at IN11 (Institut Laue Langevin, Grenoble), has demonstrated its high flexibility, and that there are no electrical limitations with respect to energy resolution tuning. Our NSE-NRSE setup overcomes restrictions of the dynamic range of both the NSE and the NRSE method.
与其他非弹性中子散射方法不同，中子自旋回波（NSE，F. 梅泽伊，《物理学报》，1972年，255卷，146页）直接在时域中测试样品动力学。相应的能量分辨率是所有中子散射方法中最高的。在NSE中，比较样品前后在磁场中积累的自旋相位。中子共振自旋回波（NRSE）技术（R. 盖勒和R. 戈卢布，《物理学报B》，1987年，65卷，269页）依赖于与NSE类似的原理。使用额外的射频频率线圈可显著减小静态磁场线圈的尺寸。此外，NSE和NRSE的动态范围最多限制在三个数量级。而且，NRSE仪器的调谐限于由电气条件预先确定的少数共振频率。为了提高NSE仪器的灵活性，并能够研究在更宽自旋回波时间范围内的动力学，我们在单个装置中结合了NSE和NRSE这两种方法。在法国格勒诺布尔劳厄 - 朗之万研究所（ILL）的IN11使用新的NSE - NRSE装置进行的测试实验，证明了其高灵活性，并且在能量分辨率调谐方面没有电气限制。我们的NSE - NRSE装置克服了NSE和NRSE方法在动态范围上的限制。
