Theoretical interpretation of the infrared lineshape of gaseous propynoic and acrylic acid dimers

We have applied a model using quantum indirect relaxation [P. Blaise, et al., J. Chem. Phys. 122 (2005) 64306] to unpolarized νX–H infrared (IR) lineshapes of centrosymmetric cyclic (HC≡CCOOH/D)2 and (H2C=HCOOH/D)2 in gaseous phase. The approach reproduces satisfactorily the main features of the experimental lineshapes by using a minimum number of independent parameters.