cyanonaphthalenes Archives

Top left panel (a): Comparison of the UV absorption of indene with an elevated value at λ < 0.19 µm (“higher Cabs”; black long-dashed line) and that with the absorption at λ < 0.19 µm extrapolated from that at λ > 0.19 µm (“lower Cabs”; magenta dashed line). The UV absorption at λ > 0.19 µm for both cases is the same as Figure 1. Bottom left panel (b): Comparison of the MMP83 interstellar radiation field (red) with the radiation fields represented by different stellar effective temperatures (Teff = 40, 000 K: blue; Teff = 22, 000 K: cyan; and Teff = 8, 000 K: green). All the radiation intensities are normalized at λ = 0.2 µm. Right panel (c): Comparison of the model IR emission spectrum of indene in the diffuse ISM calculated with an elevated UV absorption at λ < 0.19 µm (dashed blue line) and that with the extrapolated UV absorption at λ < 0.19 µm (solid red line). -- astro-ph.GA

Astrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Imaging & Spectroscopy, Status Report

Infrared Emission of Specific Polycyclic Aromatic Hydrocarbon Molecules: Indene

by Keith CowingMarch 12, 2024March 12, 2024

Polycyclic aromatic hydrocarbon (PAH) molecules have long been suggested to be present in the interstellar medium (ISM). Nevertheless, despite their expected ubiquity and sustained searching efforts, identifying specific interstellar PAH […]

Left panel (a): Comparison of the IR emission spectra of 1-CNN of a natural line width of γ = 30 cm−1 (red line) for each vibrational transition with that of γ = 10 cm−1 (blue line). The molecule is illuminated by the MMP83 (U = 1) interstellar radiation field. Right panel (b): Same as (a) but for a comparison of γ = 30 cm−1 (red line) with γ = 50 cm−1 (blue line). - astro-ph.GA

Astrochemistry, Astronomy & Telescopes, Biogeochemical Cycles & Geobiology, Imaging & Spectroscopy, Interstellar, Status Report

Infrared Emission of Specific Polycyclic Aromatic Hydrocarbon Molecules: Cyanonaphthalenes

by Keith CowingMarch 12, 2024March 12, 2024

The unidentified infrared emission (UIE) features at 3.3, 6.2, 7.7, 8.6, 11.3 and 12.7 micron are ubiquitously seen in a wide variety of astrophysical regions and commonly attributed to polycyclic […]

Astrochemistry, Press Release

Laboratory Rotational Spectroscopy And Astronomical Search Of Ethynyl Substituted Naphthalene

by Keith CowingDecember 14, 2022December 14, 2022

The recent interstellar detection of cyanonaphthalenes bring interest in related aromatic molecular species that could be present in similar astronomical environments.