Highly unsaturated hydrocarbons as potential carriers of some diffuse interstellar bands

Abstract

view Abstract Citations (35) References (24) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Highly Unsaturated Hydrocarbons as Potential Carriers of Some Diffuse Interstellar Bands Freivogel, P. ; Fulara, J. ; Maier, J. P. Abstract Absorption spectra of highly unsaturated hydrocarbons were obtained in 5 K neon matrices by means of an approach which combines mass-selection and matrix isolation techniques. Mass-selected carbon species, Cn Hm(-) with n = 14 or 16 and m less than 3, were condensed with neon to form a matrix at 5 K using concomitant mercury lamp irradiation. In the 600-860 nm region, many of the observed electronic absorption bands lie close to known diffuse interstellar bands (DIBs); the matches are especially striking above 700 nm. For the hitherto studied species, comprised of 6 to 16 carbons, 17 bands above 600 nm 'coincide' with DIBs within +/- 36 cm-1, the criterion chosen to accommodate a possible neon matrix-gas phase shift. The observation of the first members of vibrational progressions for some of the bands with corresponding DIBs allows predictions for astrophysical studies to test this proposal. Publication: The Astrophysical Journal Pub Date: August 1994 DOI: 10.1086/187495 Bibcode: 1994ApJ...431L.151F Keywords: Interstellar Gas; Molecules; Absorption Spectra; Interplanetary Dust; Kinetic Energy; Astrophysics; ISM: MOLECULES; MOLECULAR DATA; TECHNIQUES: SPECTROSCOPIC full text sources ADS |