Ramsauer-Townsend effect
Bruce gives some references at the end of this talk:
https://speakerdeck.com/bruceravel/the-ramsauer-townsend-effect-in-x-ray-absorption-spectroscopy
-R.
On 9/19/2017 2:06 AM, Shoaib Muhammad wrote:
Dear All,
I have a question that is not directly related to Athena or Artemis
but it is more related with EXAFS theory. I work on lithium metal
oxides and sometimes measure their XAS data. XAS data show typical
trend, i.e; first prominent peak related with metal-oxygen
co-ordination shell and second prominent peak is associated with
metal-metal co-ordination shell in my materials. I have noticed that
in similar crystal structures Li2MO3-type (where M is transition
metal), if metal belongs to 3d transition metal groups I get a single
prominent metal-metal peak but for 5d transition metals, the
metal-metal peak splits and its intensity also drops. I could not
figure out the reason for the splitting of metal-metal peak in case of
5d metals. I have attached a PDF file in which calculated EXAFS
spectra for Li2RuO3 (4d transition metal) and Li2PtO3 (5d transition
metal) are shown and metal-metal (Pt-Pt) peak in Li2PtO3 shows clear
splitting whereas metal-metal peak for Li2RuO3 does not split even
though their “ATOMS” input files are very similar.
I would appreciate if anybody could briefly explain the reason for
metal-metal peak splitting in 5d metals or point me towards any
literature. Attachment can be downloaded from the below link as well.
https://www.dropbox.com/s/1m3kf764junuukk/Metal-Metal%20Peak%20Splitting%20in%205d.pdf?dl=0
Thanks,
*Shoaib Muhammad*
Department of Energy Science
Sungkyunkwan University (South Korea)
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