UV absorption cross-sections of the monomer and dimer of formic acid

Abstract

Absorption cross-sections of the monomer and dimer of formic acid vapor at 302 K have been determined at 1 nm intervals from 195 to 250 nm by non-linear least-squares analysis of the per cent transmission of 29 pressures of formic acid at each wavelength. The observed blue shift of the absorption maximum of the dimer with respect to the monomer and the lack of vibrational structure in the spectrum of the dimer are discussed in terms of the effect of hydrogen bonding on n-π* transitions.