LIFETIME SHORTENING OF VIBRATIONAL-MODES VIA BREAKING OF HYDROGEN-BONDS PROBED WITH TRANSIENT IR-SPECTROSCOPY

Monomeric and hydrogen-bonded ethanol molecules in internal positions of oligomers are investigated in solutions of carbon tetrachloride by ultrafast time-resolved spectroscopy. A notable lifetime shortening of :he OH-stretching vibration, as a result of the existence of hydrogen bonds, is obtained from time-resolved spectroscopy: T-1 reduces from 8 ps (monomer) below 2 ps. This is accompanied by an enhanced anharmoni city of this vibration, as well as, an increasing width of the transie nt holes within the OH-stretching bands which are inhomogeneously broa dened. (C) 1998 Elsevier Science B.V. All rights reserved.