# Calculation of absorption edges of Niobium

• I
• LeoJakob
LeoJakob
I want to calculate the K and L absorption edges for Niobium (Nb).

Could anyone explain the steps to calculate these absorption edges?

I don't know how to use the Moseley law to calculate those values:

https://en.wikipedia.org/wiki/Moseley's_law

For reference, Niobium has:
• Shielding Constants:
• K-shell (σ_K): 1
• L-shell (σ_L): 7.4
• Element 41: Nb Atomic mass: 92.9064

Edge keV
K 18.9856
L-I 2.6977
L-II 2.4647
L-III 2.3705

its been quite a while for myself ( my focus last couple of decades ie early universe processes) I didn't need this so haven't done this in decades lol
that being said first you need to recognize the k shell relations vs the L shell relations

so lets post some key relations as an assist.
##\sqrt{v}=a(Z-b)## where
##a=\sqrt{3Rc/4}##
b=1
R=Rydberg constant,(1.1*10^7m^{-1} c =speed of light, Z is the atomic number

for L series
##a=\sqrt{5Rc/36}##
b=7.4

the above is from
https://www.concepts-of-physics.com/modern/media/moseleys-law.pdf
as stated its been decades for myself that alone should help if you haven't gotten this far you have the correct values above so I can only assume you got them from some table such as the table of x ray emission lines ( handy table to keep)
another useful article detailing some of the relativistic corrections

hope that helps

LeoJakob and WWGD
Thank you ! :)

Replies
1
Views
2K
• Biology and Chemistry Homework Help
Replies
1
Views
2K
• Introductory Physics Homework Help
Replies
5
Views
1K
• Biology and Chemistry Homework Help
Replies
5
Views
16K
• Science and Math Textbooks
Replies
19
Views
17K