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Laser ablation of imidazolium based ionic liquids
Yury Dessiaterik1, Tomas Baer, Roger E Miller
1Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, USA.
The Journal of Physical Chemistry. A
|January 27, 2006
Summary
Infrared ablation of ionic liquids primarily ejects intact liquid droplets. Minor components include imidazole molecules and single salt molecules, with plume temperatures around 475 K.
Area of Science:
- Physical Chemistry
- Materials Science
Background:
- Ionic liquids (ILs) are versatile salts with low melting points.
- Understanding their behavior under energetic conditions like IR ablation is crucial for applications.
Purpose of the Study:
- To investigate the species produced during infrared (IR) ablation of imidazolium-based ionic liquids.
- To quantify the relative amounts of intact droplets, molecular fragments, and single ions.
Main Methods:
- Time-of-flight mass spectrometry (TOF-MS) for analyzing ablated ionic species.
- Pulsed extraction and vacuum UV photoionization (10.5 eV) for neutral species detection.
- Chemical thermometry to measure the plume's internal temperature.
Main Results:
- Over 99% of ablated material consists of intact ionic liquid nano- or microdroplets.
- Approximately 1% is ejected as imidazole molecules (R(1)R(2)Im) via HCl elimination.
- About 0.1% is ejected as single salt molecules (R(1)R(2)Iium X).
- The internal temperature of the ablated vapor plume was measured at 475 ± 25 K.
Conclusions:
- IR ablation of imidazolium ILs predominantly results in the ejection of intact liquid.
- Molecular fragmentation and single-ion formation are minor pathways during this process.
- The measured plume temperature provides insights into the energetics of the ablation process.