NDLI: Polycyclic aromatic hydrocarbons and the diffuse interstellar bands: a survey

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Polycyclic aromatic hydrocarbons and the diffuse interstellar bands: a survey

Content Provider	NASA Technical Reports Server (NTRS)
Author	Salama, F. Galazutdinov, G. A. Musaev, F. A. Allamandola, L. J. Krelowski, J.
Copyright Year	1999
Description	We discuss the proposal relating the origin of some of the diffuse interstellar bands (DIBs) to neutral and ionized polycyclic aromatic hydrocarbons (PAHs) present in interstellar clouds. Laboratory spectra of several PAHs, isolated at low temperature in inert gas matrices, are compared with an extensive set of astronomical spectra of reddened, early type stars. From this comparison, it is concluded that PAN ions are good candidates to explain some of the DIBs. Unambiguous assignments are difficult, however, due to the shift in wavelengths and the band broadening induced in the laboratory spectra by the solid matrix. Definitive band assignments and, ultimately, the test of the of the proposal that PAH ions carry some of the DIB must await the availability of gas-phase measurements in the laboratory. The present assessment offers a guideline for future laboratory experiments by allowing the preselection of promising PAH molecules to be studied in jet expansions.
File Size	1132375
Page Count	34
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20030014814
Archival Resource Key	ark:/13960/t4qk2c22f
Language	English
Publisher Date	1999-02-04
Access Restriction	Open
Subject Keyword	Astrophysics Polycyclic Aromatic Hydrocarbons Molecular Clouds Vapor Phases Gas Expansion Diffuse Interstellar Bands Astronomical Spectroscopy Early Stars Rare Gases Interstellar Matter Low Temperature Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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