Abstract
We have measured transient absorption spectra following creation of electron-hole pairs by 600 fs pulses in the 5.7–6 eV photon energy range in potassium chloride. This is the highest excitation photon energy yet used in sub-picosecond absorption spectroscopy of defect formation in insulators. It allows two-photon excitation of electron-hole pairs in materials including the alkaline earth fluorides. Compared to previous studies on familiar samples such as KCl and KBr, a different distribution of electron-hole pair states is populated initially, and the excitation pulse interacts with a different spectrum of early photo-induced transient absorption.
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