Science topics: MethodologyAtomic Emission SpectroscopyLIBS
LIBS - Science method
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Questions related to LIBS
does anyone have experience with measuring fusion beads with LIBS?
It seems that the surface tensions are so high that the tablets simply shatter.
I would appreciate any experience and help!
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?
I need to do a PCA or spectroscopic dataset (LIBS) classification method in MATLAB. how can i get the scripts?
Why the values of the intensity ratio of doublet spectra of the laser-produced plasma spectrum differ from the theoretical value of the intensity ratio given in NIST data.
Hi, I am looking for an already developed Matlab or python code that can be used to identify the mass concentration of aerosols present in the air with the help of Laser-induced breakdown spectroscopy (LIBS). Since I already have the elemental composition spectrum of different species I would like to import intensity vs wavelength data to that existing code and drag the information out. I would be very thankful to all the researchers. Thank you.
I want to measure metal concentrations present in food or agriculture products. Are there any alternative techniques except AA spectroscopy, LIBS, and Inductively coupled plasma?
we are testing a calibration-free algorithm to estimate the concentration of a unknown material using the LIBS spectra. It is implemented in Matlab and we plan to publish it in Github for everyone to use. I was wondering if anyone know of raw spectra of materials with known concentration (for example, standard reference materials -SRMs- from NIST) made available online. We would use these spectra to test and improve the algorithm.
I have noticed that in other research disciplines (artificial intelligence above all) it is nowadays common practice to share the code and the data, in many others, and in LIBS spectroscopy in particular, it is very rare.
Thank you all in advance for your answers.
In laser-inducd breakdown spectroscopy (LIBS) experiment, argon flow often used to avoid the effects of air. But I found when argon gas blows across the surface of the sample, the spectral become unstable with lager spectral fluctuation. So, I wonder if there is any way to solve this problem.
Fiber optic bundle alignment is difficult to achieve. I am looking for a compromise among cost, effectiveness and simplicity. Could using a cosine corrector help?
I have seen a number of experimental papers where the temperature of a LIBS plasma has been measured at different delay times from the initiating laser pulse.
However, I am seeking a model (or an equation) that describes the evolution of the LIBS plasma temperature with time (after the end of the initiating laser pulse).
Can anyone suggest papers where a LIBS Plasma temperature model/equation has been proposed/described?
In LIBS, to calculate the Limit of Detection. we have to calculate the standard deviation of background signal..
how can we calculate it?
How to calculate the ratio of the constituent elements of the sample that are used as a target for the laser beam in LIBS system by using Boltzmann ?
How to calculate the ratio of the constituent elements of the sample that are used as a target for the laser beam in LIBS by using Boltzmann plot method?
I used to apply nanosecond laser (NdYAG, 1064nm, 7ns) to generate plasma, now I read some paper of femtosecon LIBS, and I a little puzzled. What is the essential difference between femtosecond laser induced breakdown spectroscopy(LIBS) or plasma and nanosecond LIBS ?
Whose line is stronger? Which one is more suitable for quantitative analysis?
Is there a way to do bulk analysis of Gold for its elemental composition that is equivalent to fire assay process but Non destructively. Like PGNAA, MuON , Photon assaying, LIBS, etc...
I need to check the jewelry and say what is the gold %, silver %, Copper % and other metals. Measurement time to be lesser and possibly without radiation effects on the product. If radiation is suspected, some active decay methods to be included.
I am looking for experts working in Gamma neutron activation analysis and Photon assaying using high energy x rays.
what is the relationship between laser wavelength and spectrometer angle in LIBS ?
While installing Gromacs with GPU+CUDA+MPI I got the error at linking of MPI.
cmake .. -DREGRESSIONTEST_DOWNLOAD=ON -DGMX_OPENMP=ON -DGMX_GPU=ON -DGPU_DEPLOYMENT_KIT_ROOT_DIR=<> -DGMX_BUILD_OWN_FFTW=ON -DGMX_PREFER_STATIC_LIBS=ON -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=<> -DGMX_OPENMP=ON -DGMX_MPI=ON -DGMX_BUILD_UNITTESTS=ON -DCMAKE_C_COMPILER=MPICC -DCMAKE_CXX_COMPILER=mpicxx
sudo make (completed successfully)
sudo make install
After 98% completion it showed the error
Please suggest how can I resolve it
i am trying to correct he self absorption of LIBS data, which one method is the best method with less errors?
curve growth method
Black body radiation reference line method
Im using LIBS technique to analyse my samples and the obtained LIBS spectra were visualized using PCA.
I was plotted my EIS data and I got that my Rs and Rb value at 10th cycle lower than at OCV, is that possible? Actually I find some reference that the resistance of electrolyte (Rs) can decrease due to the decreasing viscosity of electrolyte during cycling processes. is that same case with the resistance for Li/Na diffusion in the surface layer (Rb) ?
I am analyzing coal sample through LIBS technique but sulfur lines are not observed or detected...
Using laser-induced breakdown spectroscopy for quantitative analysis, the researcher aims to use linear regression in finding the relationship between signal intensity and the concentration of the substance. So far, laser-induced breakdown spectroscopy is a young but promising method (shown to be effective and quick in qualitative analyses) but on the aspect of quantitative analyses, it is still somewhat semi-quantitative (that is if it's interpreted from the view of a beginner using the device) such that the relationship in between the signal intensity and concentration is found rather than directly looking for a more direct unit such as grams, milligrams, or parts per million.
Using signal intensity as a variable is somewhat difficult especially when an undergraduate interested (but not highly skilled) in the use of Laser induced breakdown spectroscopy tries to interpret data. This is because the signal intensity can be disrupted by many other factors (such as the disruption of the atmosphere of the sample towards the light path as well as the need for uniformity of the sample compositions). For heavy metal analyses (such as cadmium, lead, and chromium), what can be a good calibration curve in order to prevent false results as well as underestimation/overestimation of data? :)
This is for our study on mycoremediation of tropical white-rot fungi on heavy metal contaminated soil sites, and we're very interested and set in the use of LIBS since unlike other spectroscopic methods, it does not need to have sample preparations and other tedious solubilizations of samples; which are methods that can contaminate our samples. :)
I am using LIBS to detect lead in soil. My current laser pulse energy is 10 microjoules, the repetition rate is 4KHz, and 260 laser pulses are accumulated to obtain a spectrum. The detection limit is 300ppm now. If I want to reach the detection limit of 1ppm, how much laser energy should I use?
What's the definition of noise in LIBS spectra and the difference between signal-to-noise and signal-to-background?
I was made fef3 materials with n doped carbon and without n for sodium ion batteries but the performance of n doped sample always inferior than without n doped, not like in lithium ion case. I read someone‘s comment that nitrogen is too strong for sodium ion batteries and i need the reference for that explanation. Is somebody in here knowing the reference for explain why the nitrogen not good in sodium ion batteries?
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 .?
Does anyone could tell me which kind of features should I consider between the techniques Laser-Induced Breakdown Spectroscopy and Laser Ablation Inductively Coupled Plasma Mass Spectrometry to buy an instrument that will be used in geological samples for a geochemistry fingerprint focused research?
Both use Laser Ablation for particle generation so the sample preparation step is minimal but I would like to know about the instrument and maintance costs (if somebody has a shallow idea about it), the detection limits and the advantages that have one over the other.
I deeply appreciate your help in advance.
We are preparing a project and we need and approximate price of a general equipment.
Can someone help me with multiple curve fitting method related to IDL programming language?
I am interested to fit a curve (Voigt profile) and calculate area under the curve. Considering that in the range of interest, the curve has been formed due to convolution of signals from three different sources, how can I:
1. Separately fit three curves (Deconvolution) using IDL?
2. Fit a parabolic baseline?
3. Calculate area under the curve for the three separate regions?
I have recently purchased the typical compact CCD fixed-slit fixed-wavelength-range spectrometer, and the emission lines captured from a wavelength-calibration HgAr lamp are VERY assymetrical.
An example of two emission lines can be seen in these images:
Optical efficiency and FWHM seem to be Ok, but lines are not symmetrical. What could be the reason?
Thankyou in advance!
I have a LIBS spectrum of a sample containing a dopant. I have calculated Plasma temperature and electron density. I would like to find out the concentration of the added element (dopant) in my sample.
Which impurities are present in stainless steel SS 304?
I found three transition lines of magnesium fluoride during LIBS process at 0.5 mm axial distance. Can any one tell me which elements are presents in these transition lines? Screenshot of graph is attached here.
Actually i am working on LIBS..And want to study Plasma parameters..
i want to calculate electron number density ,so please i need this answer.
In LIBS spectroscopy, if you have the sample in Ar atmosphere, did the CN emission signal affected? If yes, what expected if the sample is bacteria?
Does any of you have experience with the microPHAZIR AS Asbestos Analyzer from Thermo Scientific?
Or are you aware of any other developments for new asbestos analyzing techniques?
Those techniques can be used to analyze the performance of
a line of operating cells by monitoring various process variable and doing some specific measurement.
Currently I am working in the concept Phase for Extended I/O Signal in a ECU. I have Basic SW block from AUTOSAR for Supervisor Controller but If I want to add some more I/O Signal to the System from other microcontroller which is not in the scope of AUTOSAR. Can I built all in "Libs" block or how can I add this in CDD block?
Please see in the block diagram.
I am looking for the best company that can offer me a good LIBS instrument with a vacuum chamber and a complete automatic database that can detect and identify elements and also do some plasma calculations such as Te, Ne, etc.
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!
Currently I face some problem from my LIBS set-up. I would appreciate if you could suggest me some group working on LIBS in Asia's University..
I need to know about groups which are doing work on LIBS especially who are studying Spectroscopic details and Morphological Structures Using LIBS....
I am using Ocean Optics HR4000 spectrometer for acquiring LIBS spectra. Is there anyone know how to effectively calibrate the spectrometer without having Ocean Optics HG-1 Mercury-Argon lamp? I try to use spectra lamp (Mercury lamp) and compare the peaks wavenumber with NIST atomic database, but I am not really sure how to correctly identifying components using NIST database.
Actually i want Quantitative analysis by using Partial Least Square Regression(PLS), Principal component analysis PCA .
Which software is unfriendly, and how can i apply for Quantitative analysis
Send me basic paper from where i can understand this method(neural network) for quantitative analysis by LIBS?
In some literature about electrode processing for Lithium batteries, they mentioned about lump free dispersing which was added to slurry during mixing. For example, graphite electrode using CMC binder in water. What is the best lump free dispersing which able to apply in electrode processing for LiBs applications?
what are the applications and advantages of both techniques?
I've been working on gas-phase LIBS of some chromium carbonyl complexes in argon and I noticed I was creating cones of light inside my chamber coaxial to the focused laser beam instead of the typical "spot" plasma I've created in pure argon. See second picture (_011).
At higher laser powers, I get both the light and the typical plasma. First picture (_012)
Has anyone else working with LIBS seen this? I have trouble believing it's a "plasma" and am leaning towards florescence, but it's absurdly bright.
- laser power: <0.3 W (20.44 mJ)
- ~400 Torr argon gas
- vapor pressure at 25o C Cr(CO)6
- extension of MPD argon buffer gas signal enhancement research, (typical power: 0.015 W)
As we know LIBS is mainly used for the elemental analysis of a material. Is it possible to use femto-second and atto-second lasers? If it is possible then which is a suitable technique and why? Is there any papers related to the elemental analysis by femto-second and atto-second lasers technique? Please give the reference also. Thanks.
ı want use libsvm for classifying my test dataset but ı can't. I went to "File > Set Path > Add folder > [Select the LBSVM folder] > Save . And ı run this code: SVMStruct = svmtrain(histtrain,grupp); snc = svmclassify(SVMStruct,histogramtst) But matlab gave this error: SVMTRAIN only supports classification into two groups. GROUP contains 10 groups. Can you help me ı have 405 images for train dataset and ı have 192 images for 192 images what can ı do
When a high power laser irradiates a solid surface, material is ablated to form plasma. The mass ablated may depend on fluence, wavelength of laser, target material, etc., Is there any scaling law for the (approximate) mass ablated which can be determined from fluence of the laser, at least for Nd:YAG laser?
Can anybody give me an example how to train LIBSVM classifieir for more than two classes.
We want to measure the plasma temperature from its LIBS diagram. Obviously if the LTE condition isn't satisfied, the estimated temperature from the various species will be different. Namely, nitrogen peaks give a temperature which is distinct from that Oxygen ones. I wanna know when the LTE condition experimentally occur?
I am using Quantel brilliant ND:YAG laser. I want to trigger my spectrometer using a delay generator for laser induced breakdown spectroscopy. Spectrometer is ocean optics usb 4000. Can anybody explain me the simple way for it?
I got optical emission spectra from different aromatic nitro compounds. Some of the obtained signals I just can't classify, thus I'm searching for any database where I can get any suggestions for specific emission wavelengths.
I want to start conducting Femtosecond LIBS project. I am looking for a compact, efficient, complete commercial Femtosecond-LIBS system. The system must have good accuracy and stability.
If any of you have experience with or have used such system, please inform me.
In detail, I want to investigate aromatic compounds like Phenylacetate by a laser-based technique called Laser Induced Breakdown Spectroscopy which is an elemental analysis technique. I use short laser pulses to produce a plasma within a measuring chamber that can burn down my analyte-carrier gas mixture. Since I'm bound to analysis in the gas phase, I have to produce an aerosol of the analyte in a solvent, which in this case is toluene.
My set-up consists of a washing flask equipped with a perforator, a glass pipe with a porous glass frit at the end, which is immersed by the analyte-solvent solution. By bubbling carrier gas trough the solution, I (hope I can) produce an aerosol with enough quantities of analyte so that I will see it burnt down in the laser plasma.
Unfortunately, it seems that I haven't got any anaylte in the plasma because the different spectra (pure nitrogen, pure touluene purged with nitrogen, analyte solution purged with nigrogen) look alike.
So what can I do to bring an appropriate amount of analyte in the gas stream? Could it help to just elevate the temperature of the anaylte-solvent solution?