Relaxation Dynamics upon Ultrashort UV Photo-Excitation of an Iodide Doped Ionic Liquid and of a Pure Lithium Iodide Melt
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N. Chandrasekhar
The ultrafast dynamics of photolytically generated solvated electrons were investigated for the first time in a pure lithium iodide (LiI) melt at 480 °C and in an iodide doped room-temperature ionic liquid. A 70 fs UV-pulse was used to generate excess electrons and their subsequent transient response was monitored in the visible and near-infrared spectral regions. In LiI a pulse-duration limited rise of the induced absorption at all probe wavelengths was attributed to the formation of excess electrons. A minor portion of these electrons (∼20%) were subject to geminate recombination with a time constant of 2 ps. Thereafter, the induced absorption remained unaltered for over 100 ps. The ultrafast dynamics in an iodide doped room-temperature ionic liquid contrasts with the ultrafast response of excess electrons in LiI and in pure room temperature ionic liquids. First, the formation of solvated electrons seems to be delayed by up to 2 ps and second, iodine atoms act as efficient electron scavengers on a tens of ps time scale. As a result, ∼80% of the initially prepared solvated electrons undergo geminate recombination after about 70 ps. Furthermore, an additional component around 720 nm is attributed to the formation of diiodide.
© Oldenbourg Wissenschaftsverlag
Artikel in diesem Heft
- Preface: 92nd Bunsenkolloquium – Physical Chemistry in Ionic Liquids
- Relaxation Dynamics upon Ultrashort UV Photo-Excitation of an Iodide Doped Ionic Liquid and of a Pure Lithium Iodide Melt
- Electrochemistry in Room Temperature Ionic Liquids: A Review and Some Possible Applications
- Electrochemical Deposition of Nanostructured Metals and Alloys from Ionic Liquids
- Coating of Mild Steel by Aluminium in the Ionic Liquid [EMIm]Tf2N and its Corrosion Performance
- Microviscosity and Micropolarity Effects of Imidazolium Based Ionic Liquids Investigated by Spin Probes Their Diffusion and Spin Exchange
- Semi-Empirical Methods to Predict the Physical Properties of Ionic Liquids: An Overview of Recent Developments
- Water Vibrational Bands as a Polarity Indicator in Ionic Liquids
- Probing Lithium and Alumina Impurities in Air- and Water Stable Ionic Liquids by Cyclic Voltammetry and In Situ Scanning Tunneling Microscopy
- The Static Dielectric Constant of Ionic Liquids
- A Comparative Study on the Electronic Structure of the 1-Ethyl-3-Methylimidazolium Bis(trifluoromethylsulfonyl)amide RT-Ionic Liquid by Electron Spectroscopy and First Principles Calculations
- Phase Separation in Solutions of Room Temperature Ionic Liquids in Hydrocarbons
- Surface Studies on the Ionic Liquid 1-Ethyl-3-Methylimidazolium Ethylsulfate Using X-Ray Photoelectron Spectroscopy (XPS)
- Templating and Phase Behaviour of the Long Chain Ionic Liquid C16mimCl
- Preparation of CdSe Quantum Dots in Ionic Liquids
- Electrochemistry at Negative Potentials in Bis(trifluoromethanesulfonyl)amide Ionic Liquids
- Enthalpies of Solution of Organic Solutes in the Ionic Liquids [Me3BuN][NTf2] and [EMIM][EtSO4]
- Electrodeposition of Metals for Micro- and Nanostructuring at Interfaces between Solid, Liquid and Gaseous Conductors: Dendrites, Whiskers and Nanoparticles
Artikel in diesem Heft
- Preface: 92nd Bunsenkolloquium – Physical Chemistry in Ionic Liquids
- Relaxation Dynamics upon Ultrashort UV Photo-Excitation of an Iodide Doped Ionic Liquid and of a Pure Lithium Iodide Melt
- Electrochemistry in Room Temperature Ionic Liquids: A Review and Some Possible Applications
- Electrochemical Deposition of Nanostructured Metals and Alloys from Ionic Liquids
- Coating of Mild Steel by Aluminium in the Ionic Liquid [EMIm]Tf2N and its Corrosion Performance
- Microviscosity and Micropolarity Effects of Imidazolium Based Ionic Liquids Investigated by Spin Probes Their Diffusion and Spin Exchange
- Semi-Empirical Methods to Predict the Physical Properties of Ionic Liquids: An Overview of Recent Developments
- Water Vibrational Bands as a Polarity Indicator in Ionic Liquids
- Probing Lithium and Alumina Impurities in Air- and Water Stable Ionic Liquids by Cyclic Voltammetry and In Situ Scanning Tunneling Microscopy
- The Static Dielectric Constant of Ionic Liquids
- A Comparative Study on the Electronic Structure of the 1-Ethyl-3-Methylimidazolium Bis(trifluoromethylsulfonyl)amide RT-Ionic Liquid by Electron Spectroscopy and First Principles Calculations
- Phase Separation in Solutions of Room Temperature Ionic Liquids in Hydrocarbons
- Surface Studies on the Ionic Liquid 1-Ethyl-3-Methylimidazolium Ethylsulfate Using X-Ray Photoelectron Spectroscopy (XPS)
- Templating and Phase Behaviour of the Long Chain Ionic Liquid C16mimCl
- Preparation of CdSe Quantum Dots in Ionic Liquids
- Electrochemistry at Negative Potentials in Bis(trifluoromethanesulfonyl)amide Ionic Liquids
- Enthalpies of Solution of Organic Solutes in the Ionic Liquids [Me3BuN][NTf2] and [EMIM][EtSO4]
- Electrodeposition of Metals for Micro- and Nanostructuring at Interfaces between Solid, Liquid and Gaseous Conductors: Dendrites, Whiskers and Nanoparticles
