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Jens Uhlig. Portrait.

Jens Uhlig

Senior lecturer

Jens Uhlig. Portrait.

Temperature-dependent electronic and vibrational structure of the 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide room-temperature ionic liquid surface: a study with XPS, UPS, MIES, and HREELS.

Author

  • S Krischok
  • M Eremtchenko
  • M Himmerlich
  • P Lorenz
  • Jens Uhlig
  • A Neumann
  • R Ottking
  • Wichard Beenken
  • O Höfft
  • S Bahr
  • V Kempter
  • J A Schaefer
Show all

Summary, in English

The near-surface structure of the room-temperature ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide has been investigated as a function of temperature between 100 and 620 K. We used a combination of photoelectron spectroscopies (XPS and UPS), metastable induced electron spectroscopy (MIES), and high-resolution electron energy loss spectroscopy (HREELS). The valence band and HREELS spectra are interpreted on the basis of density functional theory (DFT) calculations. At room temperature, the most pronounced structures in the HREELS, UPS, and MIES spectra are related to the CF3 group in the anion. Spectral changes observed at 100 K are interpreted as a change of the molecular orientation at the outermost surface, when the temperature is lowered. At elevated temperatures, early volatilization, starting at 350 K, is observed under reduced pressure.

Publishing year

2007

Language

English

Pages

4801-6

Publication/Series

The Journal of Physical Chemistry Part B

Volume

111

Issue

18

Document type

Article

Publisher

The American Chemical Society (ACS)

Keywords

  • Electron,Electron Energy-Loss,Electron Energy-Loss: methods,Electron: methods,Electrons,Imidazoles,Imidazoles: chemistry,Ionic Liquids,Ionic Liquids: chemistry,Microscopy,Sensitivity and Specificity,Spectrophotometry,Spectrophotometry: methods,Spectroscopy,Sulfonamides,Sulfonamides: chemistry,Surface Properties,Temperature,Vibration,X-Rays

Status

Published

ISBN/ISSN/Other

  • ISSN: 1520-6106