8 ITMP3 / 8éme conférence internationale de photoacoustique et photothermique
J. Phys. IV France 04 (1994) C7-503-C7-506
Energetics and dynamics of H bonds in carboxylic acids studied by resonant photoacoustic spectroscopyA. Winkler and P. Hess
Institute of Physical Chemistry, University of Heidelberg, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
Dissociation rates of dimeric formic (methanoic)-, acetic (ethanoic)- and propionic acid in the gas phase were measured over the pressure range 0.01-100 mbar and for temperatures between 290 K and 325 K. Standing acoustic waves in a cylindrical cavity were excited by absorption of amplitude-modulated CO2-laser radiation. Consistent sets of kinetic and thermodynamic properties of the dimer/monomer mixture were obtained from the parameters of the first radial acoustic resonances of the acoustic resonator.
© EDP Sciences 1994