title: Possible relation of water structural relaxation to water anomalies.
abstract: The anomalous behavior of thermodynamic response functions is an unsolved problem in the physics of water. The mechanism that gives rise to the dramatic indefinite increase at low temperature in the heat capacity, the compressibility, and the coefficient of thermal expansion, is unknown. We explore this problem by analyzing both new and existing experimental data on the power spectrum S(Q, ω) of bulk and confined water at ambient pressure. When decreasing the temperature, we find that the liquid undergoes a structural transformation coinciding with the onset of an extended hydrogen bond network. This network onset seems to give rise to the marked viscoelastic behavior, consistent with the interesting possibility that the sound velocity and response functions of water depend upon both the frequency and wave vector.
authors.affiliation: Dipartimento di Fisica, Università di Messina and Consiglio Nazionale delle Ricerche-Istituto per i Processi Chimico-Fisici (CNR-IPCF), I-98166 Messina, Italy. francesco.mallamace@unime.it
authors.forename: Francesco
authors.initials: F
authors.lastname: Mallamace
authors.forename: Carmelo
authors.initials: C
authors.lastname: Corsaro
authors.forename: H Eugene
authors.initials: HE
authors.lastname: Stanley