Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...503l.183d&link_type=abstract
Astrophysical Journal Letters v.503, p.L183
Astronomy and Astrophysics
Astronomy
23
Infrared: Ism: Lines And Bands, Ism: Dust, Extinction
Scientific paper
We have measured the integrated absorbance, A (in units of cm molecule ^{-1} ), for the spectral components of the 3.4 mu m CHn absorption band in hydrogenated amorphous carbon (HAC) for samples deposited at 300 and 77 K. For the asymmetric CH3 stretching band in HAC, A is found to be significantly weaker than that occurring in pure saturated aliphatic hydrocarbons, while the symmetric mode of this group has a comparable intensity in HAC and in pure hydrocarbons. This suggests that the relative strength of CH3 symmetric and asymmetric absorption components may be a useful diagnostic of CH3 bonding in interstellar carbonaceous materials. Our measured absorbances, together with observed optical depths in the 3.4 mu m absorption band in the diffuse interstellar medium, suggest that N(C)/N(H) ~ 72-97 parts per million in HAC in diffuse clouds. We discuss the possibility that aromatic carbon particles with CHn edge and defect groups may be the source of both the 2175 A extinction bump and the 3.4 mu m CHn absorption band.
Dadswell G.
Duley Walter W.
Scott David Allen
Seahra Sanjeev S.
No associations
LandOfFree
Integrated Absorbances in the 3.4 Micron CHn Band in Hydrogenated Amorphous Carbon does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Integrated Absorbances in the 3.4 Micron CHn Band in Hydrogenated Amorphous Carbon, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Integrated Absorbances in the 3.4 Micron CHn Band in Hydrogenated Amorphous Carbon will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1576103