3 e0 2 z e2 136 ev 217 2 136 ev e0 786 ev

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Unformatted text preview: w becomes small ( Z ! S )e2 Z e e2 We make an educated guess: V (r ) = ! =! 4"!0 r 4"!0 r Coulomb interac;on with a screened charge number Ze = Z ! S Hartree theory  ­e screening  ­e effec;ve charge (+2 ­S)e nucleus (+2e) Assuming a screening factor S=0.3: E0 = !2 Z e2 13.6 eV = !2(1.7 )2 13.6 eV E0 = 78.6 eV " experimental value Each electron screens approximately 1/3 of the other electron’s charge. What is the first excited state? n=2 The first excited state of He is configura;on 1s2s: n=1 !=0 ! =...
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