Measuring surface phonons using molecular spin-echo.

Measuring surface phonons using molecular spin-echo.
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DOI:
10.1039/d2cp01372j
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发表时间:
2022-06-15
影响因子:
3.3
通讯作者:
Alexandrowicz, Gil
Alexandrowicz, Gil
中科院分区:
化学2区
文献类型:
--
作者:
Chadwick, Helen;Alexandrowicz, Gil

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提出了一种用分子束测量表面声子的新方法。该方法将3He自旋回波光谱的原理扩展到分子束与表面交换能量的更复杂的情况。测量了D2在Cu(111)表面的非弹性散射。类似于氦自旋回波,可以沿着沿着最佳倾斜投影执行实验,使得可以以不受入射束的能量扩散限制的高能量分辨率来分辨能量峰。介绍了两种分子自旋回波实验的分析方法。一个经典的方法,类似于用于氦自旋回波,解释了测量的最主要的激发峰,而一个半经典的方法,使我们能够识别较小的峰,这是与分子存在的多个自旋旋转状态的复杂性。提出了一种用分子束测量表面声子的新方法。
A new method to measure surface phonons with a molecular beam is presented. The method extends the principles of 3He spin-echo spectroscopy, to the more complex case of a molecular beam exchanging energy with the surface. Measurements are presented for inelastic scattering of D2 from a Cu(111) surface. Similarly to helium spin-echo, experiments can be performed along optimal tilted projections making it possible to resolve energy peaks with a high energy resolution which is not restricted by the spread of energies of the incident beam. Two analysis methods for these molecular spin echo experiments are presented. A classical approach, analogous to that used for helium spin-echo, explains the most dominant excitation peaks measured, whereas a semi-classical approach allows us to identify smaller peaks which are related to the complexity of the multiple spin-rotation states which exist for molecules. A new method to measure surface phonons with a molecular beam is presented.
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