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Title: Plasma induced by resonance enhanced multiphoton ionization in inert gas

We present a detailed model for the evolution of resonance enhanced multiphoton ionization (REMPI) produced plasma during and after the ionizing laser pulse in inert gas (argon, as an example) at arbitrary pressures. Our theory includes the complete process of the REMPI plasma generation and losses, together with the changing gas thermodynamic parameters. The model shows that the plasma expansion follows a classical ambipolar diffusion and that gas heating results in a weak shock or acoustic wave. The gas becomes involved in the motion not only from the pressure gradient due to the heating, but also from the momentum transfer from the charged particles to gas atoms. The time dependence of the total number of electrons computed in theory matches closely with the results of coherent microwave scattering experiments.
Authors:
; ;  [1]
  1. Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544 (United States)
Publication Date:
OSTI Identifier:
21057546
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 102; Journal Issue: 12; Other Information: DOI: 10.1063/1.2825041; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AMBIPOLAR DIFFUSION; ARGON; CHARGED PARTICLES; ELECTRONS; LASERS; MICROWAVE RADIATION; MOMENTUM TRANSFER; PHOTOIONIZATION; PHOTON-ATOM COLLISIONS; PLASMA; PLASMA DIAGNOSTICS; PLASMA EXPANSION; PLASMA HEATING; PLASMA PRODUCTION; PRESSURE GRADIENTS; PULSES; RESONANCE; SHOCK WAVES; SOUND WAVES; TIME DEPENDENCE