Are fulleranes responsible for the 21 micron feature?
نویسندگان
چکیده
منابع مشابه
On the Carriers of the 21 Micron Emission Feature in Post-Asymptotic Giant Branch Stars
The mysterious 21μm emission feature seen in sixteen C-rich proto-planetary nebulae (PPNe) remains unidentified since its discovery in 1989. Over a dozen of materials are suggested as the carrier candidates. In this work we quantitatively investigate eight inorganic and one organic carrier candidates in terms of elemental abundance constraints, while previous studies mostly focus on their spect...
متن کاملIs SiS 2 the carrier of the unidentified 21 micron emission feature ?
Spectra are presented of SiS2 samples in a variety of crystal forms taken at both room temperature and at 600 K over the wavelength range from 5-25 microns. All spectra show strong features at 22.5 and 9.5 microns as well as less intense bands at 7.5, 8.5, and 12.5 microns. All room temperature spectra also show a feature at 10.7 microns that disappears on heating. One form of SiS2 shows strong...
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Observations from the Spitzer Space Telescope have drawn attention to spectroscopic structure longward of 15 mm that is associated with objects showing prominent unidentified infrared (UIR) bands in the mid-IR. If polycyclic aromatic hydrocarbons (PAHs) are indeed responsible for the UIR features, longer wavelength emission arising from out-of-plane PAH skeletal vibrations is required. Here we ...
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Titanium carbide (TiC) nanocrystals were recently proposed as the carrier of the mysterious 21 mm emission feature observed in post–asymptotic giant branch stars, based on their close spectral match and the presolar nature of meteoritic TiC nanograins (which reveals their stellar ejecta origin). But we show in this Letter that the KramersKronig dispersion relations, which relate the wavelength-...
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ژورنال
عنوان ژورنال: Chinese Journal of Chemical Physics
سال: 2020
ISSN: 1674-0068,2327-2244
DOI: 10.1063/1674-0068/cjcp1911203