Tunable wavelength soft photoionization of ionic liquid vapors

Daniel Strasser*, Fabien Goulay, Leonid Belau, Oleg Kostko, Christine Koh, Steven D. Chambreau, Ghanshyam L. Vaghjiani, Musahid Ahmed, Stephen R. Leone

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


Combined data of photoelectron spectra and photoionization efficiency curves in the near threshold ionization region of isolated ion pairs from [emim][Tf2N], [emim][Pf2N], and [dmpim][Tf2N] ionic liquid vapors reveal small shifts in the ionization energies of ion-pair systems due to cation and anion substitutions. Shifts toward higher binding energy following anion substitution are attributed to increased electronegativity of the anion itself, whereas shifts toward lower binding energies following cation substitution are attributed to an increase in the cation-anion distance that causes a lower Coulombic binding potential. The predominant ionization mechanism in the near threshold photon energy region is identified as dissociative ionization, involving the dissociation of the ion pair and the production of intact cations as the positively charged products.

Original languageAmerican English
Pages (from-to)879-883
Number of pages5
JournalJournal of Physical Chemistry A
Issue number2
StatePublished - 21 Jan 2010


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