| DOI | Resolve DOI: https://doi.org/10.1088/2041-8205/729/2/L20 |
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| Author | Search for: Maier, J. P.; Search for: Chakrabarty, S.; Search for: Mazzotti, F. J.; Search for: Rice, C. A.; Search for: Dietsche, R.; Search for: Walker, G. A. H.; Search for: Bohlender, D. A.1 |
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| Affiliation | - National Research Council of Canada. NRC Herzberg Institute of Astrophysics
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| Format | Text, Article |
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| Subject | ISM: general; ISM: lines and bands; ISM: molecules; methods: laboratory; techniques: spectroscopic |
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| Abstract | Krelowski et al. have reported a weak, diffuse interstellar band (DIB) at 5069 angstrom which appears to match in both mid-wavelength and width the A(2)Pi(u)-X(2)Pi(g) gas-phase origin absorption band of HC(4)H(+). Here, we present laboratory rotational profiles at low temperatures which are then compared with the 5069 angstrom DIB using similar to 0.1 and 0.3 angstrom line widths based on a realistic line-of-sight interstellar velocity dispersion. Neither the band shape nor the wavelength of the maximum absorption match, which makes the association of the 5069 angstrom DIB with HC(4)H(+) unlikely. The magnetic dipole transition X(2)Pi(g)Omega = 1/2 -> X(2)Pi(g)Omega = 3/2 within the ground electronic state which competes with collisional excitation is also considered. In addition, we present the laboratory gas-phase spectrum of the A(2)Pi(u)-X(2)Pi(g) transition of HC(4)H(+) measured at 25 K in an ion trap and identify further absorption bands at shorter wavelengths for comparison with future DIB data. |
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| Publication date | 2011-02-14 |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 19734693 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 75208aec-a601-483b-8550-720b37c4e940 |
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| Record created | 2012-03-28 |
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| Record modified | 2020-04-21 |
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