Born-Bethe approximation for cross section

vrinda mukund
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Hi all
I was trying to understand the Born-Bethe approximation related to cross sections for atomic and molecular collisions. All the stuffs that i got are explaining in complicated way which am not able to follow. Can anyone explain in simple terms what the theory explains? It will be of much help if some one can provide some study material which explains the basics concepts of born-bethe approximation in a simple way. Please do help...
Vrinda
 
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