Effects of collision processes between laser‐ablated fragments and ambient gases

Time and space resolved photo‐emission measurements of Cu and CuO have been done to understand collisions and oxidation processes during laser ablation of YBaCuO superconducting targets under various pressures or oxygen and argon.It has been reported that the oxygen atmosphere is necessary to compensate the oxygen deficiency during the flight of laser ablated fragments for obtaining YBaCuO superconducting thin films. What we like to report here is the effect of collisions between ambient gases and ablated fragments without oxygen.