PUMA 9 Components Axis PUMAs notation Description Monochromator M �M mth Monochromator Theta 2�M mtt Monochromator 2Theta mtx, mty Monochromator Translation x-, y- direction mgx, mgy Monochromator Goniometer x-, y- direction mfh, mfv Monochromator Focus horizontal, vertical Sample S �S psi Sample Theta 2�S phi Sample 2Theta stx, sty, stz Sample Translation x-, y-, z- direction sgx, sgy Sample Goniometer x-, y- direction Analyzer A �A ath Analyzer Theta 2�A att Analyzer 2Theta atx, aty Analyzer Translation x-, y- direction agx, agy Analyzer Goniometer x-, y- direction afh Analyzer Focus horizontal Collimators alpha1 – alpha4 Collimation 5. Experiment Procedure The aim of the experiment is to measure acoustic phonons in a germanium sample. The phonons will be measured for [110] (LA) and [001] (TA) directions in [220] BZ. The experimental procedure shall contain the following steps: Sample alignment It is very difficult to align a sample with triple axis spectrometer, if the sample orientation is absolutely unknown. A sample must be pre-aligned, this means that the vertical axis of the sample must be known and roughly perpendicular to the ‘Tanzboden’. Than we shall do the following steps: - Inform the control program of the spectrometer about a scattering plane of the sample. One must set two reciprocal vectors (in our case [110] and [001]) laying in the scattering plane. - Drive spectrometer (�M, 2�M, �S, 2�S, �A, 2�A,) to the position corresponding to [220] reflection. - Scan �S and find the Brag’s peak. - Scan corresponding goniometer axes to maximize intensity of the peak. - Do the same for other reflection [004]. - Change the offset of the �S so that the nominal �S values correspond to intensity maxima for the above reflections. Phonons measurements For our measurements we will chose the const-kf configuration with kf = 2.662 Å -1 (Ef = 14.68 meV). This means that we will scan the energy transfer �� = Ei – Ef by varying incident energy Ei (ki). We are going to use PG(002) monochromator.
10 O. Sobolev, A. Teichert, N. Jünke For LA phonon we will do constant-Q scans in the energy transfer range �� = 0 – 21 meV (0 – 8 THz) for the following points: Q(r.l.u.) = (2.1, 2.1, 0), (2.2, 2.2, 0), (2.3, 2.3, 0), (2.4, 2.4, 0), (2.5, 2.5, 0), (2.6, 2.6, 0), (2.7, 2.7, 0), (2.75, 2.75, 0). For TA phonon we will do constant-Q scans in the energy transfer range �� = 0 – 15 meV (0 – 3.6 THz) for the following points: Q(r.l.u.) = (2, 2, 0.2), (2, 2, 0.3), (2, 2, 0.4), (2, 2, 0.5), (2, 2, 0.7), (2, 2, 0.8), (2, 2, 0.9), (2, 2, 1).
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SPHERES Backscattering spectrometer
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RESEDA 3 1 Introduction Neutrons ar
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