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.show moreshow less

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Metadaten
Author:P. Schiebel, D. Ahlert, Robert U. Franz, D. Hohlwein, W. Prandl, K. Siemensmeyer, K. Wulf
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:Hochschulbibliographie
Licence (German):Creative Commons - Namensnennung, Nicht kommerziell, Keine Bearbeitung