In laser-induced plasma spectra, an element usually has multiple lines corresponding to it. In theory, how to determine which lines are most likely to excite? In addition, there are two elements in a sample with the same content, the same energy level, the same transition probability. Why are atomic lines detectable for one element and not for another?
Hi Xian-Shuang,
About your first question, you can read some theoretical papers about collisional-radiative modelling papers. About your second question, you can always find some difference. Lines are like fingerprint, they are unique. If you feel one certain line confused, than try other lines, especially from same upper configuration with different terms! If you work on experiment, try to collaborate with theoretical guys.
Best regards,
Bowen
The NIST LIBS database is a very useful resource in predicting what lines should be present in a plasma (https://physics.nist.gov/PhysRefData/ASD/LIBS/libs-form.html). The theory is based on the Saha Ionisation Equilibrium model which is bet suited to low temperature high density plasmas
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