Journal of Physical Chemistry B, Vol.101, No.32, 6205-6207, 1997
Effects of Proton Motions on the Fluorescence from 2-Naphthol-Doped Ice Ih and the Proton Ordering Transition
Fluorescence from 2-naphthol-doped ice Ih crystals was studied using a picosecond pulsed laser. Because of the incipient ESPT (excited state proton transfer) process of 2-naphthol in ice, the fluorescence lifetime is sensitive to the change in the proton configurations around the dopant. In addition to the sharp decrease above 120 K due to the increase in the mobility of proton defects, the lifetime shows a dip near 72 K, which is related to the Ih-XI proton ordering transition.