Recent content by xhtp2000

Thank you so much for your answers guys! But what is the challenge to have a multi-elemental mapping using NMR, say, is it possible to have H, C13, P, etc.all elements with odd atomic numbers at the same time?

Most books discribe NMR as a diagnotic technique for Hydrogen and its isotopes. Could Nuclear Magnetic Resonance Spectroscopy be applied for other elements with odd atomic number besides H? If so, what is the major challenge for a multi-element scanning?

It is known that the penetration depth of photon into a material depends on the energy of the photon, density and atomic number of the material; because the photon energy is normally smaller than the potential against the penetration of photon, which is the potential barrier, so the incident...

What is the energy partition in the laser-induced plasma? Based on the atomic emission spectra from the plasma, we can infer the electron temperature and electron density from Boltzmann-plot and Stark broadening, I wonder how can I calculate the total energy in this plasma?

Most ideal light radiates uniformly in all directions. It means that for each photon, the probability of each direction is the same for a single photon. The specific optical resonator design enables a laser beam to propagate in one definite direction. Could anyone tell me what modifications does...

Yes, for instance, FTIR uses Fourier transformation to convert the signal into individual wavelength, but Vis spectroscopy, like laser-induced breakdown spectroscopy, uses gratings to disperse the light into individual wavelength, I want to know if I can interchange this two techniques for light...

IR and NIR spectroscopy usually employ Fourier transformation to separate the signal into individual wavelength, UV and Vis spectroscopy normally apply gratings for light dispersion (into individual wavelength). What is the cutoff wavelength, and why is so?

Isn't it because of the the charge effect? Is Gold inert to charge effect as well? The loss of electrons in Gold does not effect its Fermi level? Will Pt also fulfil the calibration task?

Hi, guys! Gold is usually used as reference element to calibrate the detector in XPS due to the charge effect, why is Gold so specific? So what element can be the reference element for XRF and LIBS? Thanks a lot!

nope, it's about my PhD project, we are now starting sorting of the recycled materials based on chemical composition, the traditional sorting criteria is mostly based on the physical and mechanical properties, I am thinking of the relation of this hierarchy, and wondering why is a new sorting...

Dear all, is the relation between chemical composition of a material and its physical properties a peering relation or a relation of subordination？

Sorry, I had the typo in the topic, it should be"Why can't XRF and LIBS distinguish different valences of a certain element?" Dear all, I have two questions for you: 1: As in known, in the case for transition and rare Earth elements, different valences lead to totally different properties. It...

Thanks a lot! For my setup, I think 1mm resolution and a range of 100 m should be enough.

Thanks a lot! It deals with the on-line quality control of the streams on belt conveyor

I agree with that. Actually there's no measuring method to record the phase directly. If you take a took at the Euler's formula, exp(ix)=cosx+isinx, x=arctan(sinx/cosx), the definition of phase is given by a value with respect to a reference. In practice, e.g. for RADAR transmitter, two real...