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UV laser spectroscopy of mass-selected ionic liquid building blocks in the gas-phase

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Publication details

JournalChemical Physics Letters
DatePublished - 1 Aug 2015
Number of pages5
Pages (from-to)216-220
Original languageEnglish


We report the first UV laser action spectra of mass-selected aggregates composed of the cationic and anionic constituents of two ionic liquids, i.e. [BMIM<sup>+</sup>]<inf>n</inf>[Tf<inf>2</inf>N<sup>-</sup>]<inf>m</inf> and [EMIM<sup>+</sup>]<inf>n</inf>[Tf<inf>2</inf>N<sup>-</sup>]<inf>m</inf> where n ≠ m and n, m = 1,2. Each aggregate cluster displays a maximum absorption at 220 nm, the high energy limit scanned. However, the anionic and cationic aggregate photofragmentation cross-sections are notably different, indicating distinctive decay mechanisms. We compare our spectra to other gas-phase spectroscopic methods and discuss the general utility of our technique as a facile route to obtaining gas-phase electronic spectra of isolated ionic liquids.

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