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Physical-Theoretical Model on Adiabatic Expansion of the Plasma Plume in Pulsed Laser Ablation Processes

Author:

Lopez-Garcia, Martin

Category:

Research Papers

Sub-Category:

Mathematical Physics

Language:

English

Date Published:

November 3, 2018

Downloads:

28

Keywords:

Laser, Plasma, Model, Adiabatic

Abstract:

A physical-mathematical model has been designed to explain the part that corresponds to the process of adiabatic expansion, of the plasma plume generated by the PLD technique (pulsed laser deposition), based on the assumption that there is a momentary pressure increase, within once the laser pulse is applied and the plasma plume is generated, this pressure increase represents an adiabatic compression of the environment surrounding the plasma, which can be air or another gas, so the plasma expansion through the information that this compression provides us. Since the pressure of the gaseous medium is involved in the approach, as a consequence it was essential to include the speed of sound within the deduced equations, this appearance generated equations that have a connotation very similar to the equations of the theory of relativity. In a theoretical way it was possible to establish a large part of the necessary mathematical expressions, leaving the part that involved mainly the pressure as a function of time P (t) while waiting for the experimental result. Experimentally, an array was mounted that diverted the signal of a PIRANI type vacuum gauge, brand Kurt J. Lesker series 925C, to a Tektronix oscilloscope, where the variations of voltages were recorded as a function of time, once the pulse was applied laser, the voltage-pressure ratio of the pressure meter is linear in the form P (Torr) = 10 (V-6), therefore the voltage variations are identical to the variations in pressu

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