title: A Surrogate for Debye-Waller Factors from Dynamic Stokes Shifts.
abstract: We show that the short-time behavior of time-resolved fluorescence Stokes shifts (TRSS) are similar to that of the intermediate scattering function obtained from neutron scattering at q near the peak in the static structure factor for glycerol. This allows us to extract a Debye-Waller (DW) factor analog from TRSS data at times as short as 1 ps in a relatively simple way. Using the time-domain relaxation data obtained by this method we show that DW factors evaluated at times ≥ 40 ps can be directly influenced by α relaxation and thus should be used with caution when evaluating relationships between fast and slow dynamics in glassforming systems.
authors.affiliation: National Institute of Standards and Technology, Gaithersburg, MD 20899-8543.
authors.forename: Marcus T
authors.initials: MT
authors.lastname: Cicerone
authors.forename: Qin
authors.initials: Q
authors.lastname: Zhong
authors.forename: Jerainne
authors.initials: J
authors.lastname: Johnson
authors.forename: Khaled A
authors.initials: KA
authors.lastname: Aamer
authors.forename: Madhusudan
authors.initials: M
authors.lastname: Tyagi