( ( that ( is ( to say ) ) ) ( , ( ( K ( shell ( internal conversion ) ) ) ( ( ( can not ) ( happen ( if ( ( ( the ( decay energy ) ) ( of ( the nucleus ) ) ) ( is ( insufficient ( to ( overcome ( ( the ( binding energy ) ) ( of ( that electron ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (S (VP (TO to) (VP (VB say))))))) (, ,) (NP (NNP K) (NNP shell) (JJ internal) (NN conversion)) (VP (MD can) (RB not) (VP (VB happen) (SBAR (IN if) (S (NP (NP (DT the) (NN decay) (NN energy)) (PP (IN of) (NP (DT the) (NN nucleus)))) (VP (VBZ is) (ADJP (JJ insufficient) (S (VP (TO to) (VP (VB overcome) (NP (NP (DT the) (VBG binding) (NN energy)) (PP (IN of) (NP (DT that) (NN electron))))))))))))) (. .)))
that is to say, K shell internal conversion cannot happen if the decay energy of the nucleus is insufficient to overcome the binding energy of that electron.
(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)))))) (. .)))