PAH IR
Table of Contents

AIBs

$$ \begin{array}{cc} \text{Band (}\mu m\text{)} & \text{Wavenumber (cm}^{-1}\text{)} & \text{Assignment} & \text{Charge state} & \text{Label} \\ \hline \color{red}3.3 & \color{red}3030 & \color{red}\text{aromatic C–H stretching mode} & \color{red}\text{neutral} & \color{red} \bullet \\ 3.4 & 2941 & \text{aliphatic CH stretching mode in methyl groups} & \text{neutral} & \color{green} \bullet \\ & & \text{CH stretching mode in hydrogenated PAHs} & \text{neutral} & \color{green} \bullet \\ 5.2 & 1923 & \text{ combination mode, CH out of plane bend } & \text{neutral} \\ 5.65 & 1770 & \text{ combination mode, CH out of plane bend } & \text{neutral} \\ 6.0 & 1667 & \text{ CO stretching mode (?) } & \text{cation} \\ \color{red}6.2 & \color{red}1613 & \color{red}\text{ aromatic CC stretching mode } & \color{red}\text{cations} & \color{red}\blacksquare \\ 6.9 & 1449 & \text{ aliphatic CH bending modes } & \\ \color{red}7.6 & \color{red}1316 & \color{red}\text{ CC stretching and CH in-plane bending modes } & \color{red}\text{cation} & \color{red}\blacktriangle \\ \color{red}7.8 & \color{red}1282 & \color{red}\text{ CC stretching and CH in-plane bending modes } & \color{red}\text{cation} & \color{red}\blacktriangle \\ \color{red}8.6 & \color{red}1163 & \color{red}\text{ CH in-plane bending modes } & \color{red}\text{cation} \\ 11.0 & 909 & \text{ CH out-of-plane bending modes, solo } & \text{cation} \\ \color{red}11.2 & \color{red}893 & \color{red}\text{ CH out-of-plane bending modes, solo } & \color{red}\text{neutral} & \color{red} \bigstar \\ 12.0 & 833 & \text{ CH out-of-plane bending modes, duo } & \\ 12.7 & 787 & \text{ CH out-of-plane bending modes, duo } & \text{cation (?)} \\ 13.6 & 735 & \text{ CH out-of-plane bending modes, quartet } & \\ 14.2 & 704 & \text{ CH out-of-plane bending modes, quartet } & \\ 15.8 & 633 & \text{ in-plane and out-of-plane C–C–C bending modes } & \text{neutral} \\ 16.4 & 610 & \text{ in-plane and out-of-plane C–C–C bending modes (pendant ring ?) } & \text{cation (?)} \\ 17.4 & 575 & \text{ in-plane and out-of-plane C–C–C bending modes } & \text{cation} \\ 17.8 & 562 & \text{ in-plane and out-of-plane C–C–C bending modes } & \text{neutral \& cation} \\ \hline \text{Plateaus (}\mu m\text{)} \\ 3.2-3.6 & 3125-2778 & \text{overtone/combination modes, CC stretch} \\ 6.0-9.0 & 1667-1111 & \text{blend of many CC stretch/CH in-plane bend modes (in PAH clusters)} \\ 11.0-14.0 & 909-714 & \text{blend of CH out of plane bending modes (in PAH clusters)} \\ 15.0-19.0 & 667-526 & \text{blended in-plane and out-of-plane C–C–C bending modes} & \text{neutral}\\ \end{array} $$

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Hydrogenated

Protonated

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