Two-stage kinetics of single-chain collapse was clearly observed by us
ing a thinnest capillary-tube cell with a wall thickness of 0.01 mm an
d a diameter of 5 mm for dynamic light scattering (DLS) measurements.
Two relaxation times, tau(crum) for the crumpled globule state and tau
(eq) for the compact globule state, were determined for the first time
. Experimental DLS data measured in the coil-to-globule transition wer
e compared with theoretical predictions.