Abstract
This paper reviews X‐ray emission from electrolyte aqueous solutions when irradiated by intense femtosecond laser pulses in air. First, some examples of X‐ray emission spectra were shown when alkali halide aqueous solutions such as CsCl are used as samples. Dependence of X‐ray emission spectra on laser intensity, solute atomic numbers, and solute concentrations are discussed on the basis of multiphoton ionization, resonance absorption, and so on. Laser chirp effects on X‐ray emission were also discussed for understanding mechanisms occurring during a single laser pulse. X‐ray intensity increase up to 103–104 times with prepulse irradiation was also introduced, and the mechanism of X‐ray intensity increase was discussed from the viewpoint of laser ablation induced by the prepulse irradiation. Finally, preliminary results of time‐resolved X‐ray absorption fine spectroscopy using potassium iodide aqueous solution were presented. Copyright © 2012 John Wiley & Sons, Ltd.
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