NDLI: Infrared Spectra Of Protonated Aromatic Hydrocarbons And Their Neutral Counterparts In Solid Para-hydrogen

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Infrared Spectra Of Protonated Aromatic Hydrocarbons And Their Neutral Counterparts In Solid Para-hydrogen

Content Provider	Semantic Scholar
Author	Lee, Y. Tina Wu, Yu-Jong Bahou, Mohammed
Copyright Year	2014
Abstract	Protonated polycyclic aromatic hydrocarbons (HPAH) have been reported to have infrared (IR) bands at wavenumbers near those of unidentified infrared (UIR) emission bands from interstellar objects. However, recording IR spectra of HPAH in laboratories is challenging. Two spectral methods have been employed previously to yield IR spectra of HPAH. One employs IR multiphoton dissociation (IRMPD) of HPAH, but the bands are broad and red-shifted. a Another measures the single-photon IR photodissociation action spectrum of cold HPAH tagged with a weakly bound ligand, such as Ar, but application of this method to large PAH is difficult.b A new method for investigating IR spectra of HPAH and their neutral counterparts was developed using electron bombardment during p-H2 matrix deposition. With this technique, we have recorded IR absorption spectra of protonated forms of benzene (C6H7), naphthalene (1and 2-C10H9), pyrene (1-C16H11), coronene (1-C24H13), and their neutrals.c The significant superiority of the spectra thus recorded to those with the Ar-tagging and IRMPD methods is demonstrated. The narrow widths of the lines enabled us to distinguish clearly between isomers 1-C10H9 and 2-C10H9; 2-C10H9 was unstable and converted to 1-C10H9 in less than 30 min. A survey of these experimental results shows that three major lines in the 7-9 μm region are red-shifted from 7.19, 7.45, and 8.13 μm of 1-C16H11 to 7.37, 7.53, and 8.21 μm of 1-C24H13, showing the direction towards the UIR bands near 7.6, 7.8, and 8.6 μm. In contrast, the line at 11.5 μm for 1-C16H11 is blue-shifted to 11.4 μm for 1-C24H13, showing the direction toward the UIR band near 11.2 μm. Other examples will be presented if time permits.
Starting Page	1
Ending Page	1
Page Count	1
File Format	PDF HTM / HTML
DOI	10.15278/isms.2014.WG01
Alternate Webpage(s)	https://core.ac.uk/download/pdf/29153172.pdf
Alternate Webpage(s)	https://doi.org/10.15278/isms.2014.WG01
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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