Infrared spectrum of quenched carbonaceous composite (QCC). II. A new identification of the 7. 7 and 8. 6 micron unidentified infrared emission bands

Journal Article · Tue Sep 01 04:00:00 EDT 1987 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/184977· OSTI ID:5748063

Sakata, A; Wada, S; Onaka, T; Tokunaga, A T

Infrared spectrum of oxidized quenched carbonaceous composite (QCC) is presented. In addition to the features seen in unoxidized QCC, new features appear at 7.7 and 8.6 microns and the strengths of the features at 6.2, 7.3, and 11.4 microns increase. The infrared features of oxidized QCC are in good agreement with nine of 11 members of the unidentified infrared (UIR) emission bands. The absorption bands of QCC are all broad without fine structure, clearly different from sharp bands of molecules. The 7.7 and 8.6 micron features can be attributed to a cross-conjugated ketone molecular structure. A possible identification of the UIR 7.7 and 8.6 micron bands with this structure is discussed. The present results indicate that oxygen can play an important role in the structures of the UIR emitting material as well as carbon and hydrogen. 29 references.

• Research Organization: Univ. of Electro-Communications, Chofu, Japan; Tokyo Univ., Japan; Hawaii Univ., Honolulu
• OSTI ID: 5748063
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 320; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARBON
CARBONACEOUS MATERIALS
CHEMICAL COMPOSITION
COMPOSITE MATERIALS
ELECTROMAGNETIC RADIATION
ELEMENTS
EMISSION SPECTRA
HYDROGEN
INFRARED RADIATION
INFRARED SPECTRA
INTERSTELLAR SPACE
MATERIALS
NONMETALS
QUENCHING
RADIATIONS
SPACE
SPECTRA