- #1
Thermodave
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Greetings. I've been reading papers on plasma kinetics and have come across the term "shape resonance" a few times when describing peaks in electron impact cross section (function of energy). I have seen calculations attempting to explain these for atoms like helium but I'm not sure how close they are to experimental data. However, I am mostly interested in air, good old oxygen and nitrogen. This term comes up with describing ground state nitrogen (N2(X) + e- -> N2(X,v) +e-) and I've found a few papers that discuss this a bit. My crude understanding of this phenomenon is essentially that some kind of metastable ion forms. However, if this is the case than why is this part of the excitation cross section and not the ionization cross section?
On a related note, why do these resonances never show up for electronic excitations? Shouldn't there be similar peaks for the electronic states, N2(A), N2(B), etc.?
On a related note, why do these resonances never show up for electronic excitations? Shouldn't there be similar peaks for the electronic states, N2(A), N2(B), etc.?