TY - JOUR KW - pfc AU - Emily Gibson AU - Z. Shen AU - Ralph Jimenez BT - Chem. Phys. Lett. DA - 2009-05 DO - 10.1016/j.cplett.2009.04.002 N1 - JILA Pub. 8274 PY - 2009 SP - 330 EP - 335 T2 - Chem. Phys. Lett. TI - Three-pulse photon echo spectroscopy as a probe of flexibility and conformational heterogeneity in protein folding VL - 473 ER -