CosmicPAH-IRDB is a spectroscopic database providing infrared spectra of molecular species, in solid or gas phase, as a function of temperature. It also provides the empirical anharmonicity functions that characterise the temperature evolution of the band position and width.
Targeted molecules include polycyclic aromatic hydrocarbons (PAHs), fullerenes and derivative species.
The experimental data presented were obtained with the ESPOIRS setup at IRAP, which has been developed in the framework of the COLD DUST ANR project and the Nanocosmos ERC synergy project (https://nanocosmos.iff.csic.es).
ESPOIRS consists of a Bruker infrared Fourier transform spectrometer 70V equipped with a set of sources, detectors and beamsplitters allowing for measurements from 0.9 µm to about 1mm. It is equipped with a cryostat for measurements of solid state samples from 10 to 300 K, a high-temperature cell for solid state samples (300 - 1000 K) and a high-temperature gas cell (300 - 800K).
The recorded infrared spectra are analysed using the multi-component fitting tool, CosmicPAHmfit, to decompose the vibrational bands with pseudo-Voigt profiles and derive empirical anharmonicity functions which quantify the evolution of the band positions and widths with temperature.
The development of the database and the fitting tool was made possible thanks to support from CNES.
Contributions by Giacomo Mulas (OAC, INAF) and Dominique Toublanc (LCAR, UT3, CNRS) are acknowledged.