title: Dynamic susceptibility of supercooled water and its relation to the dynamic crossover phenomenon.
abstract: We study the dynamic susceptibility chi_{T}(Q,t) of deeply supercooled water by means of quasielastic neutron scattering and molecular dynamics simulations. Both techniques show an increase in the peak height of chi_{T}(Q,t) as the temperature is lowered toward the dynamic crossover temperature T_{L} . Below T_{L} , the peak height decreases steadily. We attribute this phenomenon to the change in slope of the Arrhenius plot of the translational relaxation time at T_{L} . In contrast, the peak height of the calculated four-point correlation function chi_{4}(Q,t) , directly related to the size of dynamic heterogeneity, increases toward and below T_{L} .
authors.affiliation: Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhang
authors.forename: Marco
authors.initials: M
authors.lastname: Lagi
authors.forename: Emiliano
authors.initials: E
authors.lastname: Fratini
authors.forename: Piero
authors.initials: P
authors.lastname: Baglioni
authors.forename: Eugene
authors.initials: E
authors.lastname: Mamontov
authors.forename: Sow-Hsin
authors.initials: SH
authors.lastname: Chen