It is not Z>5 but Z>3. Be (Z=4) is identifiable. Li has very low energy of characteristic radiation, not easy to detect. H and He do not produce characteristic radiation at all.
Because of the low-energy radition charcteristics of the related elements.Agree with Vladimir.It is not easy to detect them.
Best....
Detection and analysis of Li in the SEM is in fact possible now, thanks to a newly developped Soft X-ray Emission Spectrometer (SXES). The new spectrometer technology upon which SXES is based also allows to detect the valence state. In fact, valence band electrons give rise to a satellite peak in the X-ray emission.
So we are at Z>2 !
See:
Terauchi, M., et al. (2014). Chemical state information of bulk specimens obtained by SEM-based soft-X-ray emission spectrometry. Microsc Microanal 20, 692-697.
Waw, Thanks God, Thanxs to the developpers of this new spectrometer, I hope i could some day use it :)
Good evening sir, I want a detail from soft X-ray emission spectrometer characterization availability in tamil nadu.
EDS companies insist that Li and B can be detected by new investigated windowless EDS detectors. But I don't have any experience about it.
Hi Dear all,
Given this difficulty of detection of lithium, is it possible to deduce or guess its percentage during the quantitative analysis?
how can we precisely normalize the results of quantitative analysis?
I ended up to this discussion as I was trying to find information and articles about detection of lithium.
Some available articles I've found with Google are:
- Detecting Li with EDS, K. Thompson, Thermo Scientific 2014
- Detection of Lithium X-rays by EDS, Xiaobing et al, Oxford, 2013
Detection of Li K X-ray is possible by both SXES and windowless EDS. however the emission of Li X-rays by a material is hugely dependent on its particular material characteristics. For some materials such as Lithium transition metal oxides (LiFeO2, etc) generating a Li x-ray in not physically allowed. For other materials, (LiSi, LiAlO, LiS) emission of Li K X-rays can be very strong.
Hovington et al, Scanning, 2016
and
Burgess et al, Microscopy Today, 2017
have quite a bit more information on detecting Lithium using EDS
To best of my knowledge, SEM-EDX only detect the Z > 4. I am also curious about SXES (soft x-ray emission spectrometer), please share the paper with us
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