CHEMISTRY. For the article “Heterogeneity in a room-temperature ionic liquid: Persistent local environments and the red-edge effect,” by Zhonghan Hu and Claudio J. Margulis, which appeared in issue 4, January 24, 2006, of Proc Natl Acad Sci USA (103:831–836; first published January 17, 2006; 10.1073/pnas.0507364103), the authors note that in Fig. 2IB, the y-axis label “log(α2)” should instead be “α2.” The corrected figure and its legend appear below. This error does not affect the conclusions of the article.
Fig. 2.
MSD, the non-Gaussian parameter, and the self part of the van Hove correlation function. (IA) MSD vs. time for the center of mass of the cationic ring at 300, 400, and 500 K. (IB) Comparison of the non-Gaussian parameter α2 vs. time for the cations at 300, 400, and 500 K. At 400 K, the maximum is at t* = 109 ps, whereas at 300 K it shifts to 2.48 ns. (II) The self part of the van Hove correlation function for the cations and its standard Gaussian form at time t = t* for the system at 300 K. Because this system is isotropic, we only consider the radial part: 4πr2Gs(r, t*).