Enhancement of laser-induced breakdown spectroscopy signals using both hemispherical cavity and a magnetic field

2012 ◽  
Author(s):  
L. B. Guo ◽  
X. N. He ◽  
B. Y. Zhang ◽  
C. M. Li ◽  
W. Hu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Laser Induced Breakdown Spectroscopy ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

scholarly journals Magnetic field effect on laser-induced breakdown spectroscopy and surface modifications of germanium at various fluences

2017 ◽  
Vol 35 (1) ◽  
pp. 159-169 ◽  
Author(s):  
H. Iftikhar ◽  
S. Bashir ◽  
A. Dawood ◽  
M. Akram ◽  
A. Hayat ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Temperature ◽  
Surface Modifications ◽  
Laser Induced Breakdown Spectroscopy ◽  
Excitation Temperature ◽  
Number Density ◽  
Plasma Parameters ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
The Magnetic Field

AbstractThe effect of the transverse magnetic field on laser-induced breakdown spectroscopy and surface modifications of germanium (Ge) has been investigated at various fluences. Ge targets were exposed to Nd: YAG laser pulses (1064 nm, 10 ns, 1 Hz) at different fluences ranging from 3 to 25.6 J/cm2 to generate Ge plasma under argon environment at a pressure of 50 Torr. The magnetic field of strength 0.45 Tesla perpendicular to the direction of plasma expansion was employed by using two permanent magnets. The emission spectra of laser-induced Ge plasma was detected by the laser-induced breakdown spectroscopy system. The electron temperature and number density of Ge plasma are evaluated by using the Boltzmann plot and stark broadening methods, respectively. The variations in emission intensity, electron temperature (Te), and number density (ne) of Germanium plasma are explored at various fluences, with and without employment of the magnetic field. It is observed that the magnetic field is responsible for significant enhancement of both excitation temperature and number density at all fluences. It is revealed that an excitation temperature increases from Te,max,without B = 16,190 to Te,max,with B = 20,123 K. Similarly, the two times enhancement in the electron density is observed from ne,max,without B = 2 × 1018 to ne,max,with B = 4 × 1018 cm−3. The overall enhancement in Ge plasma parameters in the presence of the magnetic field is attributed to the Joule heating effect and adiabatic compression. With increasing fluence both plasma parameters increase and achieve their maxima at a fluence of 12.8 J/cm2 and then decrease. In order to correlate the plasma parameters with surface modification, scanning electron microscope analysis of irradiated Ge was performed. Droplets and cones are formed for both cases. However, the growth of ridges and distinctness of features is more pronounced in case of the absence of the magnetic field; whereas surface structures become more diffusive in the presence of the magnetic field.

Laser-induced breakdown spectroscopy of aluminum plasma in the absence and presence of magnetic field

2019 ◽  
Vol 58 (4) ◽  
pp. 1110 ◽  
Author(s):  
Naveed Ahmed Chishti ◽  
Shazia Bashir ◽  
Asadullah Dawood ◽  
Muhammad Asad Khan
Keyword(s):  
Magnetic Field ◽  
Laser Induced Breakdown Spectroscopy ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Aluminum Plasma

Effect of magnetic field on laser induced breakdown spectroscopy of zirconium dioxide (ZrO2) plasma

Optik ◽  
2017 ◽  
Vol 140 ◽  
pp. 536-544 ◽  
Author(s):  
Sadia Waheed ◽  
Shazia Bashir ◽  
Asadullah Dawood ◽  
Safia Anjum ◽  
Mahreen Akram ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Zirconium Dioxide ◽  
Laser Induced Breakdown Spectroscopy ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

Spectral emission improvement by combining ambient pressures and magnetic field-deployment in laser-induced breakdown spectroscopy

Optik ◽  
2020 ◽  
Vol 201 ◽  
pp. 163340
Author(s):  
Atif Hussain ◽  
Haroon Asghar ◽  
Muhammad Tanveer ◽  
Mubeen Zafar ◽  
Qura-Tul-Ain ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Laser Induced Breakdown Spectroscopy ◽  
Spectral Emission ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Field Deployment
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