%0 Journal Article %J Chemical Physics Letters %D 2007 %T Protein dynamical transition in terahertz dielectric response %A Markelz, Andrea G. %A Knab, Joseph R. %A Chen, Jing Yin %A He, Yunfen %X

The 200K protein dynamical transition is observed for the first time in the terahertz dielectric response. The complex dielectric permittivity ε=ε′+iε″ is determined in the 0.2–2.0THz and 80–294K ranges. ε″ has a linear temperature dependence up to 200K then sharply increases. The low temperature linear dependence in ε″ suggests anharmonicity for temperatures 80K<t<180k, challenging="" the="" assumed="" harmonicity="" below="" 200k.="" temperature="" dependence="" is="" consistent="" with="" thermally="" activated="" sidechain="" motions="" and="" shows="" involved="" in="" dynamical="" transition="" extend="" to="" subpicosecond="" time="" scales.<="" div="">

%B Chemical Physics Letters %V 442 %P 413 - 417 %@ 0009-2614 %G eng %U https://www.sciencedirect.com/science/article/pii/S000926140700680X %N 4 %! Chemical Physics Letters %R 10.1016/j.cplett.2007.05.080