title: Tunable wavelength soft photoionization of ionic liquid vapors.
abstract: Combined data of photoelectron spectra and photoionization efficiency curves in the near threshold ionization region of isolated ion pairs from [emim][Tf(2)N], [emim][Pf(2)N], and [dmpim][Tf(2)N] 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.
authors: Department of Chemistry, University of California, Berkeley, California 94720, USA. strasser@chem.ch.huji.ac.il
authors: Daniel
authors: D
authors: Strasser
authors: Fabien
authors: F
authors: Goulay
authors: Leonid
authors: L
authors: Belau
authors: Oleg
authors: O
authors: Kostko
authors: Christine
authors: C
authors: Koh
authors: Steven D
authors: SD
authors: Chambreau
authors: Ghanshyam L
authors: GL
authors: Vaghjiani
authors: Musahid
authors: M
authors: Ahmed
authors: Stephen R
authors: SR
authors: Leone