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Effect of uniform magnetic field on laser-produced Cu plasma and the deposited particles on the target surface

Published online by Cambridge University Press:  08 May 2017

K.S. Singh ,
A. Khare  and
A.K. Sharma
K.S. Singh
Affiliation:
Department of Physics, Indian Institute of Technology Guwahati, Assam 781039, India
A. Khare
Affiliation:
Department of Physics, Indian Institute of Technology Guwahati, Assam 781039, India
A.K. Sharma*
Affiliation:
Department of Physics, Indian Institute of Technology Guwahati, Assam 781039, India
*
Address correspondence and reprint requests to: A.K. Sharma, Department of Physics, Indian Institute of Technology Guwahati, Assam 781039, India. E-mail: aksharma@iitg.ernet.in
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Abstract

Laser-produced copper plasma in the presence of variable transverse external magnetic field in air is investigated using optical emission spectroscopy. As the magnetic field increases from 0 to 0.5 T, the intensity of Cu I lines initially increases and then decreases slightly at a 0.5 T. The maximum intensity enhancement of all five Cu I lines occurs at a magnetic field of 0.3 T. The increase in intensity is attributed to an increase in the electron impact excitation of Cu. With increase in magnetic field, the electron density and temperature were found to increase due to increase in the confinement of plasma. The difference in intensity enhancement factor is due to the difference in excitation rate coefficients. The surface morphology of irradiated copper target is also analyzed at 0.3 T magnetic field at which the density is maximum and reveals the formation of Cu/Cu2O/CuO nanoparticles (NPs). More NPs are formed at the peripheral region than at the central region of the ablated crater and is due to the oxidation of Cu atom in the plasma–ambient interface. The larger grain size of nanostructures in the presence of magnetic field is due to an increase in the inverse pulsed laser deposition. The intensity of Raman peak of Cu2O decreases in the presence of magnetic field and that of CuO increases which is more likely due to conversion of Cu2O to CuO. The photoluminescence intensity of CuO increases in the presence of magnetic field due to the phase transformation of Cu2O to CuO in agreement with the result of Raman spectroscopy.

Keywords

Laser ablationMagnetic confinementPhotoluminescenceRaman spectroscopy
Type
Research Article
Information
Laser and Particle Beams , Volume 35 , Issue 2 , June 2017 , pp. 352 - 361
Copyright
Copyright © Cambridge University Press 2017 

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