Transport of neutral atoms, monoxides and clusters in the plume produced by laser ablation of YBa 2 Cu 3 O 7−{ce:italic}x{/ce:italic} in oxygen environment

Gas-dynamic effects of the interaction between a pulsed laser-ablation plume and the ambient gas: analogy with an underexpanded jet

“…The experimental arrangement has been reported in detail previously [21,29,31,32]. In brief, a stoichiometric YBCO target was placed on a rotating/translating holder in a chamber having a 60 mm diameter and a 90 mm length where the O 2 or Ar pressure could be varied in the range of 0.01-50 Pa.…”

Molecular dynamics simulation of shock waves in laser-material interaction

“…4.1 the secondary shock wave is practically hard to observe in the atomic configuration due to its weak strength, it is clearly visible in the velocity and pressure distribution enclosed, where at the front of the secondary shockwave, a peak of the pressure and velocity is very visible. Similar behavior has been observed in TOF measurements for various plume species analyzed by mass spectroscopy (Bulgakov et al, 1996), and successful attempt of modeling has been performed by the gas dynamic model (Bulgakov and Bulgakova, 1995). These results show remarkable good agreement with those scientific output on the velocity and pressure distribution, despite the difference of the inspected materials and slight disparity in the values.…”

“…Work by Singh et al (2005) provided study on the effect of ambient pressure on the redeposition of debris and the plume backward motion. Furthermore, the issue of pulse characteristic of the plume expansion was reported by Bulgakov et al (1996) Time-of-flight (TOF) signal oscillations according to generation of the primary and secondary shock wave in the plume-background gas interaction was observed in their experimental work (Bulgakov et al,. 1996), and that exceptional feature has been covered also empirically (Bulgakov and Bulgakova, 1995).…”

“…The most in-depth one that gives very detailed accounts of the concerned effect is given by Geohegan and Puretzky (1995) who provided first time compelling evidence of the plume splitting for yttrium in argon environment , and compared with results in several other systems, including Si/Ar, Si/He, YBCO/O 2 (Geohegan and Puretzky, 1995) Furthermore, the authors interpreted the experimental results using hydrodynamic model that includes multiple scattering to exemplify this occurrence (Leboeuf et al, 1996 andWood et al, 1997). The nature of plume double-peaked arrangement in the background gas has been widely investigated by Bulgakov et al (1995Bulgakov et al ( , 1996Bulgakov et al ( , 1998Bulgakov et al ( , 2000 based on superconductor YBCO in oxygen and an endeavor of the respectable gas-dynamical modeling has been conducted. In prominent study by Harilal (2001) the plume splitting has been observed also in carbon/helium system for different laser fluences, and the plume splitting effect was observed only in a particular pressure range in an Al/air system (Harilal et al, 2002).…”

Ablation plume structure and dynamics in ambient gas observed by laser-induced fluorescence imaging spectroscopy

“…According to Monte Carlo simulations of plume dynamics [42], it has been shown that, after plume expansion ceases, the plume boundary shrinks slightly owing to the overexpansion effect and again starts to expand (plume oscillation) [43,44]. Thus, the observed shrinkage can be interpreted as this behavior.…”