( ( Depending ( upon ( ( the type ) ( of interaction ) ) ) ) ( , ( ( either ( ( ( the ( atomic nucleus ) ) or ) ( one ( of ( its ( orbital electrons ) ) ) ) ) ) ( ( may ( absorb ( the ( excitation energy ) ) ) ) . ) ) ) )
(ROOT (S (PP (VBG Depending) (PP (IN upon) (NP (NP (DT the) (NN type)) (PP (IN of) (NP (NN interaction)))))) (, ,) (NP (CC either) (NP (DT the) (JJ atomic) (NN nucleus)) (CC or) (NP (NP (CD one)) (PP (IN of) (NP (PRP$ its) (JJ orbital) (NNS electrons))))) (VP (MD may) (VP (VB absorb) (NP (DT the) (NN excitation) (NN energy)))) (. .)))
Depending upon the type of interaction, either the atomic nucleus or one of its orbital electrons may absorb the excitation energy.
(ROOT (S (NP (DT An) (NN electron)) (VP (VBZ moves) (PP (TO to) (NP (NP (DT a) (NN shell)) (ADVP (RB farther) (PP (IN from) (NP (DT the) (NN nucleus)))))) (SBAR (IN after) (S (NP (PRP it)) (VP (VBZ absorbs) (NP (NN energy)))))) (. .)))