Petroleum, coal and other organics in space

Abstract

The petroleum and coal models of the unidentified infrared emissions (UIE), sometimes referred also as unidentified infrared bands (UIBs) has been reviewed mainly based on the work of the authors with the inclusion of unpublished results. It is shown that the petroleum and coal model of the UIE converges and merges quite well with the MAON (Mixed Aromatic Aliphatic Organic Nanoparticles) model of the UIE. It is shown that the thermal treatment of various substrates like PAHs, alkylated PAHs but also mixed aliphatic/olefinic substrates leads invariable to carbonaceous materials matching the infrared spectrum of anthracite coal or certain petroleum fractions. Thus, the experimental thermal processing (which under space conditions could be equivalent to the expected processing by shock waves or high energy radiation) of mixed aromatic/aliphatic organic matter can be used to match also the UIE evolution. Another way to simulate the thermal/radiation processing of organic matter in space, can be achieved through the carbon arc. Simple substrates processed in this way produce carbon soot and a plethora of organic molecules. Fullerenes are found in space both through mid-infrared and optical spectroscopy and it is very likely that other complex related species such as endohedral fullerenes (i.e. fullerenes with a metal, heteroatom or molecules inside the cage) may be formed in space. After all, their formation requires the same conditions as those needed for fullerene formation provided that also a metal vapour (e.g. interstellar/circumstellar gas) is available. The last part of this review is thus dedicated to the recent results on the study and characterization of an endohedral C60 derivative containing lithium inside the cage.

GTC/CanariCam Mid-IR Imaging of the Fullerene-rich Planetary Nebula IC 418: Searching for the Spatial Distribution of Fullerene-like Molecules

“…More complex fullerenebased species can emit at this wavelength. For example, laboratory IR spectra of fullerene-based species like fullerene-PAHs adducts display spectral features strikingly similar to those from C 60 (and C 70 ) fullerenes (e.g., García-Hernández et al 2013Cataldo et al 2014Cataldo et al , 2015. Furthermore, a recent theoretical study of the vibrational modes of hydrogenated fullerenes (fulleranes; C 60 H m , m=2-36) shows that the four mid-IR bands (at ∼7.0, 8.5, 17.4, and 18.9 µm) of the C 60 -skeletal vibrations are stronger in fullerenes at low hydrogenation (m=2-8) and the astronomically observed IR bands assigned to C 60 could be due to fullerenes/fulleranes mix-tures (Zhang et al 2017).…”

The mystery of unidentified infrared emission bands

“…The aromatic C-H stretch at 3.3 μm and aliphatic C-H stretch at 3.4 μm is commonly seen in many carbonaceous compounds (Cataldo et al. 2020 ). There are also olefinic C-H stretching modes in this wavelength region.…”

Unexplained spectral phenomena in the interstellar medium: an introduction

“…The possible ERE-DIB connection is also discussed by Witt and Lai (2020). The scenario of coal and petroleum related compounds as carriers of UIE is discussed by Cataldo et al (2020). The possibilities of hydrogenated fullerenes as carriers of DIB, ERE, and 220 nm features are reviewed by Zhang et al (2020).…”