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Evidence of two distinct local structures of water from ambient to supercooled conditions

Author

Listed:
  • A. Taschin

    (European Lab for Non-Linear Spectroscopy (LENS), Univ. di Firenze)

  • P. Bartolini

    (European Lab for Non-Linear Spectroscopy (LENS), Univ. di Firenze)

  • R. Eramo

    (European Lab for Non-Linear Spectroscopy (LENS), Univ. di Firenze
    Istituto Nazionale Ottica, CNR)

  • R. Righini

    (European Lab for Non-Linear Spectroscopy (LENS), Univ. di Firenze
    Dip. di Chimica, Univ. di Firenze)

  • R. Torre

    (European Lab for Non-Linear Spectroscopy (LENS), Univ. di Firenze
    Dip. di Fisica e Astronomia, Univ. di Firenze)

Abstract

The liquid and supercooled states of water show a series of anomalies whose nature is debated. A key role is attributed to the formation of structural aggregates induced by critical phenomena occurring deep in the supercooled region; the nature of the water anomalies and of the hidden critical processes remains elusive. Here we report a time-resolved optical Kerr effect investigation of the vibrational dynamics and relaxation processes in supercooled bulk water. The experiment measures the water intermolecular vibrations and the structural relaxation process in an extended temperature range, and with unprecedented data quality. A mode-coupling analysis of the experimental data enables to characterize the intermolecular vibrational modes and their interplay with the structural relaxation process. The results bring evidence of the coexistence of two local configurations, which are interpreted as high-density and low-density water forms, with an increasing weight of the latter at low temperatures.

Suggested Citation

  • A. Taschin & P. Bartolini & R. Eramo & R. Righini & R. Torre, 2013. "Evidence of two distinct local structures of water from ambient to supercooled conditions," Nature Communications, Nature, vol. 4(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms3401
    DOI: 10.1038/ncomms3401
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    Cited by:

    1. Rizzatti, Eduardo Osório & Gomes Filho, Márcio Sampaio & Malard, Mariana & Barbosa, Marco Aurélio A., 2019. "Waterlike anomalies in the Bose–Hubbard model," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 518(C), pages 323-330.

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