Abstract Details
| Name: Tanuja Singh Affiliation: Banaras Hindu University Conference ID: ASI2019_201 Title : Astrophysical PAHs: vibrational spectra Authors and Co-Authors : Tanuja Singh, Amit Pathak Abstract Type : Poster Abstract Category : Stars, ISM and Galaxy Abstract : The ubiquitous presence of polycyclic Aromatic Hydrocarbon (PAH) molecules and its variants in the ISM is confirmed by the widespread observations of the mid-infrared bands at 3.3, 6.2, 7.7, 8.6, 11.2 and 12.7 μm. These bands, also known as ‘Aromatic Infrared Bands (AIBs)’ arise from the vibrational relaxation of PAH molecules on absorption of background UV photons. However, the exact form of PAH molecules that are responsible for the AIBs is still ambiguous. We discuss different possible form of interstellar PAH molecules as carriers for AIBs. Density Functional Theory (DFT) calculation on several classes of PAHs is employed to study its spectral characteristics in infrared. We compare our results with observations in quest of any correlation that establishes its presence in the ISM. |