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

doi:10.1021/jp909727f

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

Institute of Chemistry

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

Abstract

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 language	English
Pages (from-to)	879-883
Number of pages	5
Journal	Journal of Physical Chemistry A
Volume	114
Issue number	2
DOIs	https://doi.org/10.1021/jp909727f
State	Published - 21 Jan 2010

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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][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.",

author = "Daniel Strasser and Fabien Goulay and Leonid Belau and Oleg Kostko and Christine Koh and Chambreau, {Steven D.} and Vaghjiani, {Ghanshyam L.} and Musahid Ahmed and Leone, {Stephen R.}",

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doi = "10.1021/jp909727f",

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TY - JOUR

T1 - Tunable wavelength soft photoionization of ionic liquid vapors

AU - Strasser, Daniel

AU - Goulay, Fabien

AU - Belau, Leonid

AU - Kostko, Oleg

AU - Koh, Christine

AU - Chambreau, Steven D.

AU - Vaghjiani, Ghanshyam L.

AU - Ahmed, Musahid

AU - Leone, Stephen R.

PY - 2010/1/21

Y1 - 2010/1/21

N2 - 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.

AB - 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.

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VL - 114

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JO - Journal of Physical Chemistry A

JF - Journal of Physical Chemistry A

IS - 2

ER -

Tunable wavelength soft photoionization of ionic liquid vapors

Abstract

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