Partial conversion of neutron incoherent into coherent scattering by NH3 quantum rotators
- Neutron diffraction experiments on powders are used to investigate the quantum mechanical behaviour of uniaxial rotators, i.e. NH3-molecules in Ni(NH3)6(PF6)2, Co(NH3)6(PF6)2 and Ni(NH3)6I2. A diffuse temperature dependent component of the total scattering, modulated ∼ sin QrH-H/QrH-H, is observed at a temperature of ≃ 20 K and below. This observation is due to the fact, that on cooling the sample to kT ∼ B (rotational constant) the rotational ground state is strongly populated. The ground stateNeutron diffraction experiments on powders are used to investigate the quantum mechanical behaviour of uniaxial rotators, i.e. NH3-molecules in Ni(NH3)6(PF6)2, Co(NH3)6(PF6)2 and Ni(NH3)6I2. A diffuse temperature dependent component of the total scattering, modulated ∼ sin QrH-H/QrH-H, is observed at a temperature of ≃ 20 K and below. This observation is due to the fact, that on cooling the sample to kT ∼ B (rotational constant) the rotational ground state is strongly populated. The ground state of a uniaxial free rotator, however, is completely polarized. As a consequence the scattering of those NH3 groups being in the ground state becomes coherent and is observable in diffraction experiments.…
Author: | P. Schiebel, D. Ahlert, Robert U. Franz, D. Hohlwein, W. Prandl, K. Siemensmeyer, K. Wulf |
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DOI: | https://doi.org/10.1016/0921-4526(96)00312-2 |
Parent Title (English): | In: Physica B: Condensed Matter 226 (1996) 1–3, pp 234–237 |
Document Type: | Article |
Language: | English |
Year of Publishing: | 1996 |
Date of Publication (online): | 2014/10/28 |
Release Date: | 2014/10/28 |
First Page: | 234 |
Last Page: | 237 |
University Bibliography: | Hochschulbibliografie |
Licence (German): | Creative Commons - Namensnennung, Nicht kommerziell, Keine Bearbeitung |