Feshbach resonance: ELI5 or resources for undergraduate

[bt623]

I'm working on a description of ultracold chemistry and one of the modes of tuning the interactions involves Feshbach resonance. Right now I'm referring to Feshbach's original piece and accompanying it with Pethick and Smith book titled Bose-Einstein Condensation in Dilute Gases, specifically the 5th and 17th chapters. I want to be able to explain the phenomena and how it can be used to study ultracold chemical reactions.

I think I understand the mechanism, but I'm hoping someone else on here can try an give an intuitive take on the process and possibly some references to better help me considering I am an undergraduate.

Much thank in advance, and if this post is formatted wrong or outright improper for this page, please let me know.

 

[DrClaude]

I think I understand the mechanism, but I'm hoping someone else on here can try an give an intuitive take on the process and possibly some references to better help me considering I am an undergraduate.

I don't have a specific reference at hand, so it would be easier for me if you explained what you understand about Feshbach resonances.