18354
Pericyclic reactions with energies E well above the potential energy barrier B ( case E > B ) proceed with quantum nuclear flux densities < j > which are essentially proportional to the nuclear densities rho in the femtosecond time domain .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None