Electronic State Distributions of YBa2Cu3O7-x Laser Ablated Plumes

<p>Emission from YBCO laser-ablated plumes was studied to characterize the PLD process. A KrF laser was used to ablate a bulk YBCO target at oxygen pressures ranging from 50-400 mTorr. Spectra were collected for the 500-860 nm bandpass at target distances ranging from 31.4-55.0 mm. Line fluences were corrected for self-absorption and state distributions were calculated using recently updated transition probabilities. Electronic temperatures ranged from 0.28 0.01 eV to 0.37 0.03 eV for Y I 0.28 0.01 eV to 0.35 0.03 eV for Ba I and 0.40 0.02 eV to 0.48 0.05 eV for Cu I-consistent with prior literature. Results were insensitive to position and oxygen pressure. Spectrally-filtered imagery was used to determine plume velocities shock strengths and time-of-flight curves. Effects of time-varying temperatures and number densities on observed state distributions were modeled predicting a slight elevation of Cu temperatures compared to Ba. However this was not sufficient to explain experimental results. Surprisal analysis of state distributions resulted in linear constraints consistent with an exponential gap law for electronic excitation.</p><p>This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact and remains as true to the original work as possible. Therefore you will see the original copyright references library stamps (as most of these works have been housed in our most important libraries around the world) and other notations in the work.</p><p>This work is in the public domain in the United States of America and possibly other nations. Within the United States you may freely copy and distribute this work as no entity (individual or corporate) has a copyright on the body of the work.</p><p>As a reproduction of a historical artifact this work may contain missing or blurred pages poor pictures errant marks etc. Scholars believe and we concur that this work is important enough to be preserved reproduced and made generally available to the public. We appreciate your support of the preservation process and thank you for being an important part of keeping this knowledge alive and relevant.</p>