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Record 55 of 15066
Vibrational Spectroscopy after OSU - From C2- to Interstellar Polycyclic Aromatic Hydrocarbons
Author and Affiliation:
Allamandola, Louis J.(NASA Ames Research Center, Moffett Field, CA, United States)
Abstract: The composition of interstellar ice and dust provides insight into the chemical history of the interstellar medium and early solar system. It is now possible to probe this unique and unusual chemistry and determine the composition of these microscopic interstellar particles which are hundreds to many thousands of light years away thanks to substantial progress in two areas: astronomical spectroscopic techniques in the middle-infrared, the spectral region most diagnostic of chemical composition, and laboratory simulations which realistically reproduce the critical conditions in various interstellar environments. High quality infrared spectra of many different astronomical sources, some associated with giant, dark molecular clouds -the birthplace of stars and planets- and others in more tenuous, UV radiation rich regions are now available. The fundamentals of IR spectroscopy and what comparisons of astronomical IR spectra with laboratory spectra of materials prepared under realistic simulated interstellar conditions tell us about the components of these materials is the subject of this talk. These observations have shown that mixed molecular ices comprised of H2O, CH3OH, CO, NH3 and H2CO contain most of the molecular material in molecular clouds and that gas phase, ionized polycyclic aromatic hydrocarbons (PAHs) are widespread and surprisingly abundant throughout most of the interstellar medium.
Publication Date: Jan 01, 2006
Document ID:
20060053353
(Acquired Nov 29, 2006)
Subject Category: ASTROPHYSICS
Document Type: Conference Paper
Meeting Information: Nibler Symposium and Birthday Re-Union Part; 11 Aug. 2006; OR; United States
Financial Sponsor: NASA Ames Research Center; Moffett Field, CA, United States
Organization Source: NASA Ames Research Center; Moffett Field, CA, United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: VIBRATION; INTERSTELLAR MATTER; COSMIC DUST; CHEMICAL COMPOSITION; VAPOR PHASES; SPECTROSCOPY; ULTRAVIOLET RADIATION; ICE; POLYCYCLIC AROMATIC HYDROCARBONS; SIMULATION; SOLAR SYSTEM; SPECTRAL BANDS
Availability Source: Other Sources
Availability Notes: Abstract Only
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