Time‐resolved femtosecond CARS of the ionic liquid 1‐ethyl‐3‐methylimidazolium ethylsulfate. (14th April 2015)

• Record Type: Journal Article
• Authors: Kiefer, Johannes; Namboodiri, Mahesh; Kazemi, Mehdi M.; Materny, Arnulf; Joubert, Pierre; Lavorel, Bruno; Kiefer, Johannes; Moger, Julian
• Is Part Of: Journal of Raman spectroscopy. Volume 46:Number 8(2015:Aug.)
• Page Start: 722
• Page End: 726
• Publication Date: 2015-04-14
• Subjects: Raman spectroscopy -- Periodicals; 535.846
• DOI: 10.1002/jrs.4692
• Languages: English
• ISSNs: 0377-0486

Abstract

<abstract abstract-type="main"> <title> <x xml:space="preserve">Abstract</x> </title> <p>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 1400 cm⁻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 © 2015 John Wiley &amp; Sons, Ltd.</p> </abstract>