Moseley and X‑ray Spectra

As 2019 is the 150th anniversary of the Mendeleev’s Periodic Table, UNESCO has proclaimed this year the International Year of the Periodic Table (IYPT2019). One of the most important steps in the evolution of the Periodic Table is the concept of atomic number, established by Moseley. In this article...

Full description

Saved in:
Bibliographic Details
Published in:Journal of chemical education 2019-07, Vol.96 (7), p.1424-1430
Main Authors: Sant’Anna, Rafaela T. P, Monteiro, Emily V, Pires, Romulo O, Peres, Rosa C. D, Faria, Roberto B
Format: Article
Language:English
Subjects:
Atomic properties
Atomic theory
Atoms & subatomic particles
Chemical elements
Chemistry
College Science
Data Use
Discussion (Teaching Technique)
Electron transitions
Graduate Students
Instructional Effectiveness
Nuclear Physics
Periodic table
Radiation
Science Instruction
Spectrum analysis
Theories
Undergraduate Students
X ray spectra
X-rays
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:As 2019 is the 150th anniversary of the Mendeleev’s Periodic Table, UNESCO has proclaimed this year the International Year of the Periodic Table (IYPT2019). One of the most important steps in the evolution of the Periodic Table is the concept of atomic number, established by Moseley. In this article, his work is commented on, and the emission of X-ray lines is interpreted on the basis of a one-electron transition using Bohr’s theory. The agreement is very good for the Kα and Kβ lines, which can be used in classes to reinforce the quantized model of atoms. It is also shown that inner-electron-screening effects play a significant role, especially in the L-series lines. In addition to the discussion based on Bohr’s theory, the several different X-ray lines that are known for each element are also explained using LS spin–orbit-coupling spectroscopic terms. The presentation of X-ray data and discussion of the data using these two theoretical approaches in both undergraduate and graduate classes resulted in significant grade improvements on the topic of atomic theory.
ISSN:0021-9584
1938-1328
DOI:10.1021/acs.jchemed.8b01012