how does this XRF works if I place a silver ball, that's wrapped with a 22K gold sheet? Will that detect the silver content thru that gold, or will detect only the purity of gold?
Am not an expert on the subject, but I assume that it will only measure the gold. XRF is used to measure atomes on the surface of materials and not in materials
At 1:44 wouldn't it be an electron from the outer shells that is excited (and certainly not removed)? Inner electrons are shielded by outer ones. The most inner electrons need the most work to remove them, as they are the closest to the core.
@@rlrrlrll Remember that different wavelengths of EM radiation have different energies. In gen chem, you learn that certain wavelengths are emitted when electrons move from an excited state down to a lower level. All of the wavelengths you calculate with the Rydberg equation are UV or visible light. Go down to a lower-energy sort of radiation--infrared--and you no longer have enough energy to excite electrons to the next energy level, so instead you induce molecular vibrations. Go up to a higher-energy radiation and you basically excite electrons right out of the atom! X-rays can absolutely knock electrons out of the valence shell, but in that case we don't see the fluorescence used in XRF. As you mentioned in your original comment, it would take a lot of energy to knock out electrons closest to the core...but X-rays have that much energy! I'll get around to doing my own XRF video some day...not quite ready to do that yet.
@@Double0pi Thank you for the explanations! I assumed Xrays are more powerful, but powerful enough to kick out electrons close to the core, that's pretty exciting :D
@@Double0pi isn't there an error in this video? The narrator says the x-rays knock an election out of "a low energy level", but isn't it a HIGH energy level (hence the need for a photon of such high energy to eject it) and merely a LOW orbital number? Aren't the "outer" valence electrons actually in the lower energy levels? Also I'm afraid I cannot help but notice you are at the Evergreen State college....home to the most infamous incident on any college campus in the nation in the past several years. What is that like, especially being in the science department where there were organized efforts to "decolonize chemistry" and suchlike at the height of the insanity? Were you ever in contact with Bret or Heather?
the intro "bang" took my soul out of my body and brought it back again.
Like the video guys! She's at gunpoint...
Thanks! I am working on a essay about XRF and this video helped me so much!
Wouah well explained 👌, best video on XRF so far! I am covered. Thank you very much!
Make a video on wdxrf as well. Explaining the function of analyzing crystal and collimator. Thanx
Good explanation
how does this XRF works if I place a silver ball, that's wrapped with a 22K gold sheet? Will that detect the silver content thru that gold, or will detect only the purity of gold?
Am not an expert on the subject, but I assume that it will only measure the gold. XRF is used to measure atomes on the surface of materials and not in materials
@@dragondrago1740 it wil not penetrate enough to detect the silver ball it wil only go a few micro's in the base material
XRF only detect the appearance 30um coat.
Wiil this xray show the difference between mild steel and chromoly
And the thickness
2:01 could've animated secondary radiation as moving outward and not inward, it may confuse people
Greatly explained 🙏🙏
Thank you
How to analyze the data after mapping from beamline?
thank you Schatzi
short and crisp
Great explanation. Thank you.
Thanks
Does mass of the sample have effect on the results after the analysis?
can this measure coating thicknesses in multiple layers?
No, it can't. You probably can try XPS for that.
With all the charisma
What you expect? Egghead afterall...
Can u explain how to use it in tunnels not on the surtface
Martinez Christopher Hall Amy Clark Jose
Bonjoure a toute stp j'ai besoin des thèses sur XRF
At 1:44 wouldn't it be an electron from the outer shells that is excited (and certainly not removed)? Inner electrons are shielded by outer ones. The most inner electrons need the most work to remove them, as they are the closest to the core.
Nope. XRF removes core electrons. The outer electrons then "fall down" to the lower energy levels, emitting characteristic X-ray spectra as they go.
@@Double0pi Interesting! Never heard of that phenomenon before. I'll ask my prof about that :) thanks!
@@rlrrlrll Remember that different wavelengths of EM radiation have different energies. In gen chem, you learn that certain wavelengths are emitted when electrons move from an excited state down to a lower level. All of the wavelengths you calculate with the Rydberg equation are UV or visible light.
Go down to a lower-energy sort of radiation--infrared--and you no longer have enough energy to excite electrons to the next energy level, so instead you induce molecular vibrations.
Go up to a higher-energy radiation and you basically excite electrons right out of the atom! X-rays can absolutely knock electrons out of the valence shell, but in that case we don't see the fluorescence used in XRF. As you mentioned in your original comment, it would take a lot of energy to knock out electrons closest to the core...but X-rays have that much energy!
I'll get around to doing my own XRF video some day...not quite ready to do that yet.
@@Double0pi Thank you for the explanations! I assumed Xrays are more powerful, but powerful enough to kick out electrons close to the core, that's pretty exciting :D
@@Double0pi isn't there an error in this video? The narrator says the x-rays knock an election out of "a low energy level", but isn't it a HIGH energy level (hence the need for a photon of such high energy to eject it) and merely a LOW orbital number? Aren't the "outer" valence electrons actually in the lower energy levels?
Also I'm afraid I cannot help but notice you are at the Evergreen State college....home to the most infamous incident on any college campus in the nation in the past several years. What is that like, especially being in the science department where there were organized efforts to "decolonize chemistry" and suchlike at the height of the insanity? Were you ever in contact with Bret or Heather?
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Est ce que tu peut me aide moi
Thank you(@/@)!
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Send me information please . I will visit the web site
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great 3.5 mins
Thanku
Thank you
Thanks
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thanks