Question
Asked 23rd Jul, 2018
Sagheer Mehmood
Sagheer Mehmood

Why Argon gas is used in LIBS experiment.?

Why Argon gas is being used in LIBS experiment.?
I have read a paper
" (LIBS) of Heavy Metal Ions at the Sub-Parts per Million Level in Water "
in which they have used flowing argon gas while performing experiment.. why .?
LIBS
Argon

Most recent answer

30th Jul, 2018
Sagheer Mehmood
Quaid-i-Azam University
Thanku Sir Muhammad Aslam Baig and All Others
Cite

Popular answers (1)

23rd Jul, 2018
Virendra Nath Rai
Raja Ramanna Centre for Advanced Technology
Dear Sagheer
Please read carefuly that paper. If they have used argon gas in the experiment. They must have explained the reason for using that gas. However in general argon gas is used in LIBS experiment to enhance the signal (sensitivity) of the LIBS. The shock wave generated at the boundary of plasma and argon gas compresses the plasma, which increases the plasma temperature and density resulting in comparatively higher LIBS signal.
Cite
3 Recommendations

Top contributors to discussions in this field

Frank T. Edelmann
Frank T. Edelmann
Hany Kasban
Hany Kasban
Johannes Gruenwald
Johannes Gruenwald
Carmen Mateescu
Carmen Mateescu
Emile A. D. Carbone
Emile A. D. Carbone

All Answers (4)

23rd Jul, 2018
Virendra Nath Rai
Raja Ramanna Centre for Advanced Technology
Dear Sagheer
Please read carefuly that paper. If they have used argon gas in the experiment. They must have explained the reason for using that gas. However in general argon gas is used in LIBS experiment to enhance the signal (sensitivity) of the LIBS. The shock wave generated at the boundary of plasma and argon gas compresses the plasma, which increases the plasma temperature and density resulting in comparatively higher LIBS signal.
Cite
3 Recommendations
23rd Jul, 2018
Rajib Biswas
Tezpur University
Argon is used basically to increase signal.The cause of the overall signal enhancement is due to the confinement of the laser-induced plasma in the presence of argon. Due to the heavier density and lower thermal conductivity of argon relative to air, the overall plasma is confined near the sample surface in argon relative to air. The confined plasma increases the number of collisions that might be responsible for more excitation of species in the laser-induced plasma and leads to the enhancement of the overall LIBS signal in an argon atmosphere.
Cite
30th Jul, 2018
Sagheer Mehmood
Quaid-i-Azam University
Thanku Sir Muhammad Aslam Baig and All Others
Cite

Similar questions and discussions

What‘s the difference between signal-to-noise and signal-to-background in LIBS spectra?
Question
7 answers
  • Asked 8th Apr, 2013
  • Hodge DouHodge Dou
What's the definition of noise in LIBS spectra and the difference between signal-to-noise and signal-to-background?
What information can we get in the continuous radiation of the laser-inuduced breakdown spectroscopy(LIBS)?
Question
4 answers
  • Asked 22nd Apr, 2022
  • Xian-Shuang WangXian-Shuang Wang
As we know, atomic and molecular emission lines of laser-induced breakdown spectra can be used for quantitative analysis, classification, etc. Does continuous radiation, which is usually subtracted in quantitative analysis, contain any useful physical information?Are there any applications for continuous radiation in LIBS?
Question about power density and energy density in lasers?
Question
14 answers
  • Asked 27th Apr, 2021
  • Mohammed AlsarhanMohammed Alsarhan
Could someone please inform me on how to calculate power density (W/cm2) and energy density (J/cm2) for the following laser settings:
300 mW (maximum 1W) for 60 seconds and repetition rate of 2kHz with a fiber diameter of 300 µm
How to measure the velocity of shock wave of the laser induced plasma?
Question
11 answers
  • Asked 6th Nov, 2018
  • Xian-Shuang WangXian-Shuang Wang
  1. Now I am attempting to measure the velocity of shock wave of laser induced plasma using laser heterodyne interference。 But the signal is too weak to detect.
The minimum spot a laser beam can be focused?
Question
24 answers
  • Asked 26th Oct, 2016
  • Qiuyu XiaQiuyu Xia
Given the wavelength of the laser, how small can we focus the beam spot? Or what is the minimum beam waist after it is focused? Is there any relative experiment?
Is there any software for calibration-free LIBS?
Question
1 answer
  • Asked 26th Apr, 2016
  • Adolfo CoboAdolfo Cobo
Many published works use calibration-free LIBS technique to get an estimation of the sample's composition in laser-induced breakdown spectroscopy (LIBS) Does anyone know of any available commercial or free software to do it?  Thanks in advance!
Simulation of phase change materials with Comsol Multiphysics
Discussion
2 replies
  • Asked 15th Sep, 2022
  • Prakash SinghPrakash Singh
How to model phase change simulation with Comsol Multiphysics?
I am trying to simulate fluid flow between two PCMs (air flows between two parallel plates geometry). I have already gone through different Comsol blogs as well as mph files. But still,
I have some doubts which are as follows:
1. I have used the conjugate heat transfer model, Is this the best way to simulate or should I consider some other models?
2. I am directly putting the latent heat value (L). Since the value(approx 190000 kJ/kg) is very large, Is this is ok to do so? (kindly suggest, whether should I use the step function?)
3. Kindly suggest important things or physics to do or keep in mind in Comsol when someone simulates a phase change and fluid flow problem.
Can anyone share mph file of the melting process of PCM(any geometry) with Comsol?
Please suggest some good papers on PCM which has been simulated using Comsol Multiphysics.
Regards
Prakash singh
Hi, I am doing MD simulation using Lammps. what does it mean to run 100000 steps and then relaxed over 400000steps ?
Question
7 answers
  • Asked 6th Sep, 2022
  • Mariam IrheaMariam Irhea
additionally, how can we calculate different cooling rates when we melt a system up to 3300k and quench at room temperature for 10000000 steps

Related Publications

Laser light scattering in LIBS plasma in argon
Article
  • Sep 2011
[O1, Session 1 : Laser Plasma Diagnostics and Fundamentals-I] Communication orale (A.Mendys)
View
Comparative study on self-absorption of laser-induced tungsten plasma in air and in argon
Article
  • Feb 2019
The onset of self-absorption of laser-induced plasma poses a problem for converting emission line intensities to concentrations, which is one of the main bottlenecks in quantitative laser-induced breakdown spectroscopy (LIBS) measurements. In this paper, the effects of atmosphere and laser fluence on self-absorption reduction of the plasma induced...
View
View
Got a technical question?
Get high-quality answers from experts.
Ask a question