Expansion of the laser ablation vapor plume into a background gas:Part A, Analysis
A study of the gas dynamics of the vapor plume generatedduring laser ablation was conducted including a counterpropagatinginternal shock wave. The density, pressure, and temperature distributionsbetween the external shock wave front and the sample surface weredetermined by solving the integrated conservation equations of mass,momentum, and energy. The positions of the shock waves and the contactsurface (boundary that separates the compressed ambient gas and the vaporplume) were obtained when the incident laser energy that is transferredto the vapor plume and to the background gas, E, and the vaporized samplemass, M, are specified. The values for E and M were obtained from acomparison of the calculated trajectories of the external shock wave andthe contact surface with experimental results for a copper sample underdifferent laser fluences. Thus E and M, which are the two dominantparameters for laser ablation and which cannot be measured directly, canbe determined. In addition, the internal shock wave propagation withinthe vapor plume was determined; the interaction of the internal shockwave with the sample may be one of the mechanisms inducing liquid sampleejection during laser ablation. (c) 2007 American Institute ofPhysics.
- Research Organization:
- Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
- Sponsoring Organization:
- USDOE Director. Office of Science. Office of AdvancedScientific Computing Program. Office of Basic Energy Sciences,Administrator for the National Nuclear Security Administration.Nonproliferation and National Security Program Direction
- DOE Contract Number:
- AC02-05CH11231
- OSTI ID:
- 902143
- Report Number(s):
- LBNL--62129; BnR: NN2001000
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 2 Vol. 101; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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