NDLI: Time-integrated optical emission studies on laser-produced copper plasma in the presence of magnetic field in air ambient at atmospheric pressure

Content Provider	Springer Nature Link
Author	Singh, Khwairakpam Shantakumar Sharma, Ashwini Kumar
Copyright Year	2017
Abstract	We report on the effect of laser fluence variation on ablation rate and the time-integrated optical emission of copper plasma in the presence of static transverse magnetic field in air. In the presence of magnetic field, the ablation rate at 14 Jcm−2 laser fluence is around two times higher than that in the absence of magnetic field. It is attributed to an increase in melt ejection caused by recoil pressure of ablated mass in the presence of magnetic field. We also simulated the laser ablation rate using finite element method to justify that the ablation rate is higher in the presence of magnetic field. The intensity of atomic/ionic transition is enhanced in the presence of magnetic field. The enhancement in the intensity of spectral line depends on laser fluence and it is pronounced at fluence 14 Jcm−2. The intensity enhancement is due to an increase in electron-impact excitation and recombination process as a result of magnetic confinement of plasma. The ionic line also showed intensity enhancement in the presence of the magnetic field. It is due to the increase in ionization of atom in the presence of magnetic field. The ionization potential is lowered in the presence of magnetic field which results in more ionization. The electron density and temperature initially increased with fluence and then decreased slightly at higher fluence. In the presence of magnetic field, the electron density and temperature followed the same trend; however, higher compared with that in the absence of magnetic field. It is attributed to magnetic confinement of plasma. The spatially resolved optical emission measurements showed that the intensity with magnetic field decreased with lateral distance. However, it is higher than that without magnetic field up to 2 mm and beyond that the intensity with and without magnetic field remained almost the same.
Starting Page	1
Ending Page	12
Page Count	12
File Format	PDF
ISSN	09478396
Journal	Applied Physics A
Volume Number	123
Issue Number	5
e-ISSN	14320630
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2017-04-08
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Condensed Matter Physics Optical and Electronic Materials Nanotechnology Characterization and Evaluation of Materials Surfaces and Interfaces, Thin Films Operating Procedures, Materials Treatment
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Science

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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