Abstract- A home-made dc sputtering is characterized by cathode potential of 250-2000 V and sputtering gas pressures of (3.5×10-2 – 1.5) mbar. This paper studies in experiment the breakdown of argon, a uniform dc electric field at different discharge gaps and cathode potentials. Paschen curves for Argon are obtained by measuring the breakdown voltage of gas within at different target cu,Au,Ag, vacuum chamber . The Paschen curves in Ar gases show that the breakdown voltage between two electrodes is a function of pd (The product of the pressure inside the chamber and distance between the electrodes). Current-voltage characteristics visualization of the discharge indicate that the discharge is operating in the abnormal glow region.
Keywords: gold target , gas discharge, glow discharge, plasma , dc sputtering.
I. INTRODUCTION
Dc glow discharges are widely applied for depositing thin films, etching, plasma polymerization, oxidation, and pumping gas discharge lasers, etc. Therefore the research into the conditions of the dc glow discharge is of considerable interest [1]-[6]. Plasmas are ionized gases; hence, they consist of positive (and negative) ions and electrons, as well as neutral species. Therefore, the ignition of the dc glow discharge is one of the oldest problems in the study of low-pressure gas discharges. The mechanism of the gas discharge can be explained as follows: When a sufficiently high potential difference is applied between two electrodes placed in a
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The Hindenburg disaster happened in 1937. The cause of the disaster was an electrostatic discharge which lead to igniting the hydrogen that was leaking. The ship before it crush had a major problems with hydrogen leaking. So until today the investigation show that the spark happened because of the difference of electric charge of the airship and the atmosphere which 60 meters about sea level to ignite fire in the ship. The ship didn’t last long in the air because it was filled with flammable gas.
AP Chemistry Mrs. Johnson Chemistry Butane and Inquiry Lab Submitted By Germaine Washington September 30, 2016 Abstract The purpose of these experiments was to determine the validity of the Ideal Gas Law. In the first experiment we used a Butane lighter to conduct a collection of C4H10 gas over water, with which we would measure the volume of the butane produced. It was found the 0.16 g of Butane gas at 299°K and 1.005 atm held a volume of 100mL. The results supported the Ideal Gas Law, PV = nRT.
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