Hybrid compounds based on fullerene and polycyclic aromatic hydrocarbons with absorption in the near infrared region

2013 ◽  
Vol 1018 ◽  
pp. 50-58 ◽  
Author(s):  
Ricardo Faccio ◽  
Helena Pardo ◽  
Alvaro W. Mombrú
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Near Infrared ◽  
Infrared Region ◽  
Hybrid Compounds ◽  
Polycyclic Aromatic ◽  
Near Infrared Region

scholarly journals Processing of polycyclic aromatic hydrocarbons in evolved planetary nebulae

2011 ◽  
Vol 7 (S283) ◽  
pp. 462-463
Author(s):  
Ryou Ohsawa ◽  
Takashi Onaka ◽  
Itsuki Sakon ◽  
Issei Yamamura ◽  
Mikako Matsuura ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Near Infrared ◽  
Planetary Nebulae ◽  
Infrared Emission ◽  
Chemical Processing ◽  
Evolutionary Phase ◽  
Polycyclic Aromatic ◽  
Stellar Temperatures ◽  
Evolution Sequence

AbstractWe investigate the infrared emission bands from Polycyclic Aromatic Hydrocarbons (PAHs) in Galactic planetary nebulae (PNe). PAHs in PNe are assumed to be in transition from circumstellar to interstellar PAHs. We select 15 evolved PNe taking account of effective stellar temperatures and obtain infrared spectra of PNe from AKARI (2.5–5 μm) and Spitzer (5–14 μm) observations. Their evolutionary phase is estimated using [SIV]10.51/[NeII]12.81. We find that the near-infrared PAH bands are significantly enhanced along with stellar evolution sequence. We also find that the ratio of 3.4 to 3.3 μm bands is enhanced. The enhancement might indicate some chemical processing, such as hydrogenation, on small PAHs.

Tunable upconversion in a nanocrystal–organic molecule hybrid: reabsorptionvs.resonant energy transfer

2018 ◽  
Vol 20 (41) ◽  
pp. 26513-26521 ◽  
Author(s):  
Chaojun Li ◽  
Xiaofeng Liu ◽  
Jianrong Qiu
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Energy Transfer ◽  
Organic Semiconductors ◽  
Aromatic Hydrocarbons ◽  
Organic Molecule ◽  
Near Infrared ◽  
Nir Light ◽  
Polycyclic Aromatic

Organic semiconductors, such as polycyclic aromatic hydrocarbons, are typically not responsive to near infrared (NIR) light due to their relatively large bandgaps.

scholarly journals Various Aspects of the Spectroscopy of PAHs (Polycyclic Aromatic Hydrocarbons)

2002 ◽  
Vol 12 ◽  
pp. 44-47
Author(s):  
Philippe Bréchignac
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Charge State ◽  
Aromatic Hydrocarbons ◽  
Near Infrared ◽  
Spectroscopic Properties ◽  
Infrared Emission ◽  
Ir Absorption ◽  
Near Ir ◽  
Polycyclic Aromatic ◽  
Infrared Intensities

AbstractThe exploitation of the recent observations (in particular by ISO) of the near infrared emission bands (UIBs) requires a good knowledge of the spectroscopic properties of the main proposed carriers, i.e. the Polycyclic Aromatic Hydrocarbons, which are expected to act as efficient UV/visible to infrared free-flying light converters.The charge state of the interstellar PAHs strongly affects their spectroscopy. The laboratory study of the electronic transitions of PAH cations in the gas phase enables to address important questions, like their possible contribution to the Diffuse Interstellar Bands (visible and near-IR absorption), and the mechanism responsible for electronic to vibrational intramolecular energy conversion.Microcanonical simulations based on hybrid quantum/classical theoretical methods reveal how strongly affected are the infrared intensities by both the charge state and the vibrational temperature.

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