Halide electronic absorption spectroscopy

Appleby, D., Hussey, C.L., Seddon, K.R., Turp, J.E., Room-temperature ionic liquids as solvents for electronic absorption spectroscopy of halide complexes. Nature, 323,614-615,1986. 

Molten salts have a wide range of unique properties that make them particularly useful in many areas of modern technology. From the fundamental point of view understanding speciation of transition metals in halide melts leads to deeper understanding the nature of complex ion formation in ionic media. The most interesting and direct information about the structure of chloride melts can be procured from in situ electronic absorption spectroscopy measurements. In the case of niobium the information obtained can be applied for optimising industrial scale niobium production and refining. 

Photoinduced electron injection is by no means a new development. This process has already been applied in areas such as silver halide photography. In this discussion, only sensitized TiC>2 surfaces will be considered. Many experiments have shown that the charge injection into the semiconductor surface is very fast. In order to study these processes, fast spectroscopic techniques are preferred. Whether or not charge injection takes place can be studied conveniently on the nanosecond time-scale by using transient absorption spectroscopy. However, to address the injection process directly, experiments are carried out on the femtosecond time-scale, while recombination and charge separation require the nanosecond to microsecond range. 

Shallow traps for electrons were first detected experimentally in nominally pure silver halides by Brandt and Brown [77] using UV-induced IR absorption spectroscopy. This and subsequent optical and magnetic resonance studies demonstrated that, when filled, such traps are paramagnetic,... 

Electronically Excited Halogen Atoms (2/ y2) Observed by Kinetic Spectroscopy in Absorption Following the Flash Photolysis of Polyatomic Halides... 

Zaera F, Hoffmann H and Griffiths P R 1990 Determination of molecular chemisorption geometries using reflection-absorption infrared spectroscopy alkyl halides on Pt(1 )J. Electron. Spectrosc. Relat. Phenom. 54/55 705-15... 

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