时间分辨中子背散射法研究铝酸钠溶液的氢释放
Hydrogen Release from Sodium Alanate Observed by Time-resolved Neutron Backscattering
摘要：
Na3AlH6中的内分子运动在180 ° C下产生了与波数无关的约1微eV宽度的洛伦兹光谱，这可能是由于AlH6四面体的旋转。在NaAlH_4和NaH中没有这种准弹性线。基于这一发现，使用中子背散射光谱仪SPHERES上的时间分辨测量来监测铝酸钠（NaAlH 4到Na3AlH 6到NaH）的分解动力学。这两个反应步骤被认为是加速自动催化，最有可能在表面的Na3AlH6和NaH微晶。
英文摘要：
Innermolecular motion in Na3AlH6 gives rise to a Lorentzian spectrum with a wavenumber-independent width of about 1 micro-eV at 180 deg C, which is probably due to rotation of AlH6 tetrahedra. There is no such quasielastic line in NaAlH4 or NaH. Based on this finding, time-resolved measurements on the neutron backscattering spectrometer SPHERES were used to monitor the decomposition kinetics of sodium alanate, NaAlH4 to Na3AlH6 to NaH. Both reaction steps were found to be accelerated by autocatalysis, most likely at the surfaces of Na3AlH6 and NaH crystallites.
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