CHEM 1410 Midterm: exam_2_7nov07
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Chemistry 1410, hour exam 2, nov. 7, 2007. Please work them all, and provide brief descriptions of your reasoning as appropriate. Good luck: [30%] consider a neutral helium atom in its ground state electronic configuration. We will use two extreme assumptions to obtain an upper and a lower bound on the binding energy of an electron in the atom. Namely: (a) i) assume that the orbit of the electron in question (to be denoted as the tagged electron) takes place. 2he + nucleus (the completely inside the other electron. In this situation, the tagged electron sees a bare other electron is invisible to it). Calculate the 1s energy level for this electron. In this case, the other electron completely screens the tagged electron, which then sees an effective +1 nucleus. ,m m [hence with reduced mass m m m m. 1 are bound by the central potential v r.
