Abstract

Blackbody emission from particulates generated during KrF‐laser ablation of Y1Ba2Cu3O7−x (YBCO) and BN has been recorded for the first time by sensitive photography and emission spectroscopy in order to study the velocity, temperature and cooling of the ejecta. The techniques of fast, intensified‐CCD photography and emission spectroscopy with photon‐counting sensitivity are described as diagnostics for particulate generation and temperature measurement for a wide variety of materials used for pulsed laser deposition. Time‐of‐flight velocities inferred from the two techniques indicate velocities (v∼(0.45‐1.2)×104 cm s−1) comparable to those measured for the large particles which often accompany the pulsed laser deposition (PLD) process. Gated photon counting is employed to obtain temporally resolved spectra of this weak emission. The spectral shape is characteristic of blackbody emission. The spectra shift to longer wavelengths as the particles cool during flight in vacuum. Estimates of the temperature of ...

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