THz–IR spectroscopy of single H.sub.2./sub.O molecules confined in nanocage of beryl crystal lattice

0439787 - FZÚ 2015 RIV GB eng J - Journal Article
Gorshunov, B. P. - Zhukova, E.S. - Torgashev, V. I. - Motovilova, E.A. - Lebedev, V.V. - Prokhorov, A. S. - Shakurov, G.S. - Kremer, R. K. - Uskov, V.V. - Pestrjakov, E.V. - Thomas, V.G. - Fursenko, D.A. - Kadlec, Christelle - Kadlec, Filip - Dressel, M.
THz–IR spectroscopy of single H₂O molecules confined in nanocage of beryl crystal lattice.
Phase Transitions. Roč. 87, 10-11 (2014), s. 966-972. ISSN 0141-1594. E-ISSN 1029-0338
R&D Projects: GA ČR(CZ) GA14-25639S
Institutional support: RVO:68378271
Keywords : terahertz spectroscopy * nano-confined water molecule
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 0.954, year: 2014

We have measured the terahertz-infrared (3-7000cm(-1)) spectra of the optical conductivity of iron-doped single crystals of beryl, (Mn,Fe):Be3Al2Si6O18, that contain lone water molecules isolated within nanometer-sized cages formed by the ions of beryl crystal lattice. By comparing the spectra with those of dehydrated crystals, we exclude phonon resonances and reconstruct the spectra determined exclusively by vibrations of the water molecules. At liquid-helium temperatures, well-known intramolecular H2O modes are observed above 1000cm(-1) and accompanied with satellite resonances that are combinations of intramolecular and external vibrations of H2O molecules. At terahertz frequencies, a broad bump centred around 20cm(-1) (at 5K) is observed with three rather narrow resonances at its high-frequency shoulder (38, 42 and 46cm(-1)). The origin of these low-energy excitations is discussed.
Permanent Link: http://hdl.handle.net/11104/0242985