Peripherally Hydrogenated Neutral Polycyclic Aromatic Hydrocarbons as Carriers of the 3 Micron Interstellar Infrared Emission Complex: Results from Single-Photon Infrared Emission Spectroscopy
Infrared emission spectra of five gas-phase UV laser-excited polycyclic aromatic hydrocarbons (PAHs) containing aliphatic hydrogens are compared with the main 3.3 microns and associated interstellar unidentified infrared emission bands (UIRs). We show that neutral PAHs can account for the majority o...
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| Veröffentlicht in: | The Astrophysical journal 2000-12, Vol.545 (2 Pt 1), p.854-860 |
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| container_title | The Astrophysical journal |
| container_volume | 545 |
| creator | Wagner, D. R Kim, HS Saykally, R. J |
| description | Infrared emission spectra of five gas-phase UV laser-excited polycyclic aromatic hydrocarbons (PAHs) containing aliphatic hydrogens are compared with the main 3.3 microns and associated interstellar unidentified infrared emission bands (UIRs). We show that neutral PAHs can account for the majority of the 3 microns emission complex while making little contribution to the other UIR bands; peripherally hydrogenated PAHs produce a better match to astrophysical data than do those containing methyl side groups; 3.4 microns plateau emission is shown to be a general spectral feature of vibrationally excited PAHs containing aliphatic hydrogens, especially those containing methyl groups; and finally, hot-band and overtone emissions arising from aromatic C-H vibrations are not observed in laboratory emission spectra, and therefore, in contrast to current assignments, are not expected to be observed in the UIRs. |
| doi_str_mv | 10.1086/317868 |
| format | Article |
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J</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Peripherally Hydrogenated Neutral Polycyclic Aromatic Hydrocarbons as Carriers of the 3 Micron Interstellar Infrared Emission Complex: Results from Single-Photon Infrared Emission Spectroscopy</atitle><jtitle>The Astrophysical journal</jtitle><addtitle>Astrophys J</addtitle><date>2000-12-20</date><risdate>2000</risdate><volume>545</volume><issue>2 Pt 1</issue><spage>854</spage><epage>860</epage><pages>854-860</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><abstract>Infrared emission spectra of five gas-phase UV laser-excited polycyclic aromatic hydrocarbons (PAHs) containing aliphatic hydrogens are compared with the main 3.3 microns and associated interstellar unidentified infrared emission bands (UIRs). We show that neutral PAHs can account for the majority of the 3 microns emission complex while making little contribution to the other UIR bands; peripherally hydrogenated PAHs produce a better match to astrophysical data than do those containing methyl side groups; 3.4 microns plateau emission is shown to be a general spectral feature of vibrationally excited PAHs containing aliphatic hydrogens, especially those containing methyl groups; and finally, hot-band and overtone emissions arising from aromatic C-H vibrations are not observed in laboratory emission spectra, and therefore, in contrast to current assignments, are not expected to be observed in the UIRs.</abstract><cop>Goddard Space Flight Center</cop><pub>IOP Publishing</pub><pmid>11878349</pmid><doi>10.1086/317868</doi><tpages>7</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | The Astrophysical journal, 2000-12, Vol.545 (2 Pt 1), p.854-860 |
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| source | Institute of Physics Open Access Journal Titles |
| subjects | Astronomy - instrumentation Astronomy - methods Carbon - chemistry Exobiology Extraterrestrial Environment Hydrogen - chemistry Hydrogenation Lasers Methylation Polycyclic Aromatic Hydrocarbons - analysis Space life sciences Spectrophotometry, Infrared - instrumentation Spectrophotometry, Infrared - methods |
| title | Peripherally Hydrogenated Neutral Polycyclic Aromatic Hydrocarbons as Carriers of the 3 Micron Interstellar Infrared Emission Complex: Results from Single-Photon Infrared Emission Spectroscopy |
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