Abstract Details
| Name: MRIDUSMITA BURAGOHAIN Affiliation: TEZPUR UNIVERSITY Conference ID: ASI2015_402 Title : Theoretical study of interstellar deuteronated polycyclic aromatic hydrocarbons Authors and Co-Authors : Amit Pathak, Deptt. of Physics, Tezpur University, Assam, PIN 784028 Peter Sarre, School of Chemistry, The University of Nottingham, University Park, Nottingham, NG7 2RD, UK Abstract Type : Poster Abstract Category : Stars, The Milky Way Galaxy and its neighbours Abstract : Emission features in infra red (IR) lying between 3-20 µm are proposed to arise from the relaxation of vibrationally excited Polycyclic Aromatic Hydrocarbon (PAH) molecules on absorption of UV photons [1]. Owing to the ubiquitous presence of these features, PAHs are believed to bear about 5- 10% of the interstellar carbon. Widespread presence of PAHs in the Interstellar Medium (ISM) also points to their stability and the possibility that they might be the most likely candidate carriers for Diffuse Interstellar Bands (DIBs) as well. The proposed interstellar PAH family includes deuterated PAHs (PADs), which result from the exchange of interstellar deuterium with the peripheral hydrogen atom of PAHs. The 4.4 and 4.6 µm feature detected in the Orion bar are attributed to the C-D stretching of PAHs containing deuterium [2]. Here, we report preliminary analysis of the vibrational properties of medium sized, symmetric and compact deuteronated PAHs (dPAH+) using Density Functional Theory (DFT). A comparison has also been made to understand PAH properties in terms of size and different charged states. References [1] Tielens, A. G. G. M. 2008, ARA&A, 46, 289 [2] Peeters, E., Allamandola, L. J., Bauschlicher, C. W., Jr., et al. 2004, ApJ, 604, 252 |