title: Ultrafast vibrational energy relaxation of the water bridge.
abstract: We report the energy relaxation of the OH stretch vibration of HDO molecules contained in an HDO:D(2)O water bridge using femtosecond mid-infrared pump-probe spectroscopy. We found that the vibrational lifetime is shorter (~630 ± 50 fs) than for HDO molecules in bulk HDO:D(2)O (~740 ± 40 fs). In contrast, the thermalization dynamics following the vibrational relaxation are much slower (~1.5 ± 0.4 ps) than in bulk HDO:D(2)O (~250 ± 90 fs). These differences in energy relaxation dynamics strongly indicate that the water bridge and bulk water differ on a molecular scale.
authors: FOM Institute for Atomic and Molecular Physics - AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands. piatkowski@amolf.nl
authors: Lukasz
authors: L
authors: Piatkowski
authors: Adam D
authors: AD
authors: Wexler
authors: Elmar C
authors: EC
authors: Fuchs
authors: Hinco
authors: H
authors: Schoenmaker
authors: Huib J
authors: HJ
authors: Bakker