Silicon-carbon mixed clusters

Pellarin, M.; Ray, Charles D.; Mélinon, P.; Lermé, J.; Vialle, Jean; Kéghélian, P.; Pérez, A.; Broyer, M.

doi:10.1016/s0009-2614(97)00869-5

Cited by 97 publications

(50 citation statements)

References 32 publications

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“…with a small Si proportion (e.g. Pellarin et al 1997Pellarin et al , 1999. Si atoms could also strongly bound to dehydrogenated PAHs and survive their folding into fullerene cages (Sect.…”

Section: Si and Other Silafullerenesmentioning

confidence: 99%

Interstellar fullerene compounds and diffuse interstellar bands

Omont

2016

A&A

103

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Recently, the presence of fullerenes in the interstellar medium (ISM) has been confirmed and new findings suggest that these fullerenes may possibly form from polycyclic aromatic hydrocarbons (PAHs) in the ISM. Moreover, the first confirmed identification of two strong diffuse interstellar bands (DIBs) with the fullerene, C + 60 , connects the long standing suggestion that various fullerenes could be DIB carriers. These new discoveries justify reassessing the overall importance of interstellar fullerene compounds, including fullerenes of various sizes with endohedral or exohedral inclusions and heterofullerenes (EEHFs). The phenomenology of fullerene compounds is complex. In addition to fullerene formation in grain shattering, fullerene formation from fully dehydrogenated PAHs in diffuse interstellar clouds could perhaps transform a significant percentage of the tail of low-mass PAH distribution into fullerenes including EEHFs. But many uncertain processes make it extremely difficult to assess their expected abundance, composition and size distribution, except for the substantial abundance measured for C + 60 . EEHFs share many properties with pure fullerenes, such as C 60 , as regards stability, formation/destruction and chemical processes, as well as many basic spectral features. Because DIBs are ubiquitous in all lines of sight in the ISM, we address several questions about the interstellar importance of various EEHFs, especially as possible carriers of diffuse interstellar bands. Specifically, we discuss basic interstellar properties and the likely contributions of fullerenes of various sizes and their charged counterparts such as C + 60 , and then in turn: 1) metallofullerenes; 2) heterofullerenes; 3) fulleranes; 4) fullerene-PAH compounds; 5) H 2 @C 60 . From this reassessment of the literature and from combining it with known DIB line identifications, we conclude that the general landscape of interstellar fullerene compounds is probably much richer than heretofore realized. EEHFs, together with pure fullerenes of various sizes, have many properties necessary to be suitably carriers of DIBs: carbonaceous nature; stability and resilience in the harsh conditions of the ISM; existing with various heteroatoms and ionization states; relatively easy formation; few stable isomers; spectral lines in the right spectral range; various and complex energy internal conversion; rich Jahn-Teller fine structure. This is supported by the first identification of a DIB carrier as C + 60 . Unfortunately, the lack of any precise information about the complex optical spectra of EEHFs and most pure fullerenes other than C 60 and about their interstellar abundances still precludes definitive assessment of the importance of fullerene compounds as DIB carriers. Their compounds could significantly contribute to DIBs, but it still seems difficult that they are the only important DIB carriers. Regardless, DIBs appear as the most promising way of tracing the interstellar abundances of various fullerene compounds if the breakthr...

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“…with a small Si proportion (e.g. Pellarin et al 1997Pellarin et al , 1999. Si atoms could also strongly bound to dehydrogenated PAHs and survive their folding into fullerene cages (Sect.…”

Section: Si and Other Silafullerenesmentioning

confidence: 99%

Interstellar fullerene compounds and diffuse interstellar bands

Omont

2016

A&A

103

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“…To produce mixed clusters, various approaches have been demonstrated, such as single targets of alloys [34], binary compounds [35][36][37], pressed mixed powders [38,39], and dual-target (dual-laser) sources [40][41][42][43][44]. The dual-target dual-laser source designs allow for controlling the mixing ratios by changing the laser fluences, laser timing, and the rotation and/or translation speeds of the targets.…”

Section: Introductionmentioning

confidence: 99%

Characterization of neutral boron-silicon clusters using infrared spectroscopy: The case of Si6B

Trường

Haertelt

Jaeger

et al. 2016

International Journal of Mass Spectrometry

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Nano-size clusters are of great interest for understanding of fundamental properties and processes relevant for applied materials science such as heterogeneous catalysis. In this study, we present a newly developed dualtarget dual-laser ablation source, suitable for the production of binary clusters and their spectroscopic characterization. With the current design, an almost arbitrary mixing ratio can be achieved by altering different parameters such as the laser fluences. Boron and silicon targets are chosen for cluster production, illustrating the possibility to control the outcome ranging from pure boron over mixed SinBm to pure silicon clusters. As a test system, Si6B clusters are characterized by means of infrared-ultraviolet two-color ionization (IR-UV2CI) spectroscopy, combined with quantum chemical simulations. The most stable structure of Si6B (Cs, 2 A') predicted in our previous work is confirmed by the present experiment. Doping of Si7 with a single B atom has a drastic impact on the geometric, vibrational, and electronic properties.

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“…However, there are recent reports about the synthesis of binary clusters with the general form C 2n−m Si + m , where m = 1, 2 [5], m < 4 [6,7]. It is an interesting experimental finding that a maximum of 3 Si atoms (as detected by abundance mass spectroscopy) could be incorporate into the carbon cages [5 -7], essentially preserving the fullerene structure.…”

Section: Introductionmentioning

confidence: 99%