Abstract
The ultrafast vibrational dynamics of the room-temperature ionic liquid 1-ethyl-3-methylimidazolium ethylsulfate, [EMIm][EtSO4] are studied using time-resolved femtosecond coherent anti-Stokes Raman scattering spectroscopy. Raman coherences are excited around 1040 and 1400cm(-1), the vibrational dephasing of the modes in the fingerprint region is monitored as a function of time. The results indicate that beating pairs of Raman modes typically correspond to either the cation or the anion. The assignment of mixed mode pairs is not unambiguous and, moreover, the beating patterns of such possible mixed pairs are very weak. Interestingly, no evidence for interionic vibrational energy transfer is found despite the fact that the interactions in the ion pair are characterized by strong hydrogen bonds. Copyright (c) 2015 John Wiley & Sons, Ltd.
| Original language | English |
|---|---|
| Pages (from-to) | 722-726 |
| Number of pages | 5 |
| Journal | Journal of Raman Spectroscopy |
| Volume | 46 |
| Issue number | 8 |
| Early online date | 14 Apr 2015 |
| DOIs | |
| Publication status | Published - Aug 2015 |
| Event | Joint Conference of the 13th European Conference on Nonlinear Optical Spectroscopy (ECNOS) / 33rd European CARS Workshop (ECW) - Dole, France Duration: 11 May 2014 → 14 May 2014 |
Keywords
- ultrafast dynamics
- dephasing
- Raman spectroscopy
- CARS
- LASER-INDUCED GRATINGS
- ETHYL SULFATE
- BINARY-MIXTURES
- THERMODYNAMIC PROPERTIES
- INTERFACIAL-TENSION
- SURFACE-TENSION
- IMIDAZOLIUM
- TEMPERATURE
- SOLVENTS
- ANION