Transmission and photoacoustic spectroscopy of organosulphur and aromatic hydrocarbons using coherent synchrotron radiation

This article describes transmission and photoacoustic spectroscopy experiments performed using coherent synchrotron radiation (CSR) at the Canadian Light Source. The storage ring was operated at energies of 1.0 and 1.5 GeV, with currents between 0.8 and 8.6 mA and synchrotron frequencies from 4.0 to 7.7 kHz. Relationships among these parameters and the associated energy curves were characterized in detail. Spectra of organosulphur and aromatic hydrocarbon compounds acquired using CSR exhibited absorption bands near 20 cm−1, likely due to translational and rotational motion in dimers. The location and extent of usable CSR can be modified through adjustment of the ring energy, synchrotron frequency, and ring current, making this radiation suitable for acquisition of spectra at very low wavenumbers.