Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Transport and Confinement I
CPP 17.9: Vortrag
Dienstag, 1. April 2014, 12:15–12:30, ZEU 260
Single water molecule confined in a nano-cavity of beryl crystal lattice — •Martin Dressel1, E.S. Zhukova1,2,3, V.I. Torgashev4, V.V. Lebedev3,5, G.S. Shakurov6, R.K. Kremer7, E.V. Pestrjakov8, V.G. Thomas9, D.A. Fursenko9, and B.P. Gorshunov1,2,3 — 11. Phys. Inst., Univ. Stuttgart — 2A.M. Prokhorov Gen. Phys. Inst., RAS, Moscow — 3Moscow Inst. Phys. Techn., Dolgoprudny — 4Fac. Phys., Southern Fed. Univ. Rostov-on-Don — 5Landau Inst. Theor. Phys., RAS, Chernogolovka — 6Kazan Phys.-Techn. Inst., RAS, Kazan — 7MPI Festkörperforschung, Stuttgart — 8Inst. Laser Phys., RAS, Novosibirsk — 9Inst. Geology Mineralogy, RAS, Novosibirsk
Using terahertz and infrared spectroscopy, we have studied the low-energy excitations of a single H2O molecule confined within a nano-cage formed by ions of beryl (Mn:Be3Al2Si6O18) crystal lattice. At terahertz frequencies, for electric field of the probing radiation polarized perpendicular to the crystallographic c-axis (E⊥ c) multiple resonances are discovered and assigned to librational and translational vibrations of the H2O molecule that is weakly (via hydrogen bonds) coupled to the walls of the nano-cage. Only two water-related absorption peaks are seen for the second polarization E∥ c. A model is presented that explains the resonances by taking into account the quantum tunneling between the H2O states in the minima of a six-well potential felt by a molecule within the cage. We draw analogies with the electrodynamic spectra of liquid water and ice.
Ref.: B.P. Gorshunov et al., J. Phys. Chem. Lett. 4, 2015 (2013).