Multiple fluorescence and the electronic relaxation processes of coronene vapor: The fluorescence from the S1, S2, and S3 states

Itoh, Takaò

doi:10.1016/j.jms.2008.07.007

Cited by 14 publications

(11 citation statements)

References 19 publications

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“…The main features of our spectrum are in good agreement with less-detailed previous EEL spectra in the gas phase, 7,9 and with photo-absorption data. 4,34 Note that in our experiment, carried out at intermediate incident energy, the intensity of the band at 6.36 eV is underestimated as the condition E i c E exc is only approximate. This is also the case for the data obtained at similar intermediate energy (E i = 100 eV) by Delfs et al, 9 but curiously not for Khakoo et al, 7 also recorded at E i = 100 eV, where the band at 6.36 eV seems overestimated.…”

Section: Electronic Excitationmentioning

confidence: 71%

“…3 A very important amount of work concerning the spectroscopy of the molecule has already been published (see ref. 4 and references therein), however, only a few studies concern the behaviour of coronene under electron impact. [5][6][7][8][9] Low energy (0-10 eV) electron collisions with molecules give rise to processes very different from photon-molecule interactions.…”

Section: Introductionmentioning

confidence: 99%

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Electron energy loss spectroscopy and anion formation in gas phase coronene

Abouaf

Díaz‐Tendero

2009

Phys. Chem. Chem. Phys.

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Electron collisions with gas phase coronene have been studied in the energy range 0-80 eV to investigate electronic and pure vibrational excitations, as well as the anion formation near zero energy. Quantum chemical calculations using time dependent density functional theory (TDDFT) have been performed for an improved data analysis. Results have been obtained on both dipole allowed and forbidden transitions to low lying electronic excited states up to 8 eV, by varying the incident energy and scattering observation angle. Calculated values for excitation energies are in good agreement with experiment and with previous data. Pure vibrational excitation, performed with an energy resolution of 0.025 eV, is presented at incident energies from 1.5 to 9 eV. Five groups of excited vibrational modes are observed with energy losses ranging from 0.065 to 0.375 eV. Several resonant states appear to contribute to these excitations. Calculations of the harmonic vibrational frequencies of coronene, and determination of their main character, are used for the analysis of the results. The vertical electron affinity of coronene is calculated to be 0.45 eV in very good agreement with previous measured or calculated results. The parent anion (C24H12)- yield versus electron energy presents 2 peaks at zero and 0.30 eV (within 0.030 eV), in contrast with previous results where only one peak at zero was reported

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Section: Electronic Excitationmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Electron energy loss spectroscopy and anion formation in gas phase coronene

Abouaf

Díaz‐Tendero

2009

Phys. Chem. Chem. Phys.

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“…The lack of the excitation wavelength dependence ensures that the observed fluorescence is composed of a single spectrum ( Figure S7). [16,17] On the other hand, the fluorescence from coronenes in SWCNTs exhibits characteristic features that can be attributed to the well- defined 1D arrangement of coronene molecules (Figure 3 b). [16,17] On the other hand, the fluorescence from coronenes in SWCNTs exhibits characteristic features that can be attributed to the well- defined 1D arrangement of coronene molecules (Figure 3 b).…”

mentioning

confidence: 99%

“…The emission spectrum of coronene in hexane (Figure 3 b) shows a highly structured band, with several vibrational origins in the 400-550 nm spectral region-a region that corresponds to the S 0 -S 1 transition band. [16,17] On the other hand, the fluorescence from coronenes in SWCNTs exhibits characteristic features that can be attributed to the well- defined 1D arrangement of coronene molecules (Figure 3 b). For example, even though the spectral shape becomes broader, vibrational progression is still clearly observable in the fluorescence spectrum of coronene columns.…”

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confidence: 99%

Coaxially Stacked Coronene Columns inside Single‐Walled Carbon Nanotubes

et al. 2011

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Pancakes in tubes: Coronenes, a class of planar π‐conjugated molecules, organize in 1D structures when using single‐walled carbon nanotubes (SWCNTs) as templates (see picture). Coronene columns with coaxial stacking in SWCNTs exhibit characteristic fluorescence spectra that significantly differ from those of isolated coronene molecules and three‐dimensional crystals and that are related to their well‐ordered 1D structure.

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“…Koronen, C24H12 kimyasal formüllü altı tane peri-füzyonlu (kaynaşmış) benzen halkası içeren yoğunlaştırılmış aromatik hidrokarbondur (Barış ve ark., 2017;Fetzer, 2000). Koronen karpatit adı verilen bir mineral olarak da bilinir (Itoh, 2008). Yük taşıma mekanizması ve ışık yayıcı kabiliyetinden dolayı optik ve organik elektroniğin ilgisi haline gelmiştir (Gregor ve ark., 2004;Ruifeng ve ark., 1999;Yıldırım, 2017).…”

Section: Introductionunclassified

Güneş Pilleri Uygulamalarında Kullanılan Organik Tabanlı Schottky Diyotlarında İyonize Radyasyonun Aygıt Parametrelerine Etkisi

Karadeniz

Barış

Karadeniz

et al. 2021

Karadeniz Fen Bilimleri Dergisi

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Bu çalışmada, organik araüzeyli Schottky yapısına iyonize radyasyonun etkileri araştırılmıştır. Hazırlanan metal/koronen/n-Si Schottky yapılar, değişik dozlarda gama radyasyonuna maruz bırakılmış ve bu yapıların ışınlama öncesi ve sonrası performans parametrelerindeki değişimler incelenmiştir. Organik arayüzey tabaka olarak koronen malzemesi kullanılmıştır. Arayüzey malzemesi döndürme ile kaplama tekniği kullanılarak, değişik kimyasal yöntemlerle temizlenmiş olan n-tipi silisyum tabanlar üzerine ince film olarak kaplanmıştır. Yapıların radyasyon öncesi ve sonrası elektriksel karakteristiklerindeki değişimler karanlık ortamda ve oda sıcaklığında I-V, C-V ve G-V ölçüm teknikleri kullanılarak incelenmiştir.

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Multiple fluorescence and the electronic relaxation processes of coronene vapor: The fluorescence from the S1, S2, and S3 states

Cited by 14 publications

References 19 publications

Electron energy loss spectroscopy and anion formation in gas phase coronene

Electron energy loss spectroscopy and anion formation in gas phase coronene

Coaxially Stacked Coronene Columns inside Single‐Walled Carbon Nanotubes

Güneş Pilleri Uygulamalarında Kullanılan Organik Tabanlı Schottky Diyotlarında İyonize Radyasyonun Aygıt Parametrelerine Etkisi

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