Variation Calculation for the Energy of Lithium Atom's (1s)~23p Configuration
Hu Qu · Journal of Wuhu Professional Technology College · 2003
The Lithium atom's energy of the ground state ((1s)22s configuration) and the first excited state ((1s)22p configuration ) can be calculated by using the Variation method. If using the Variation method to calculate the Lithium atom's energy of the second excited state ((1s)23p configuration),there are two problems needing attention: the first is that the three electrons of the (1s)23p configuration of the Lithium atom are on the different case, so the single-parameter method can't be used at the same time, being far from the nuclear, the 3pelectron's influence on the 1selectron is very low, so the double-parameter method is too complicated; the second is that the orthogonality between the wave function of the (1s)23p configuration and the ground state or the first excited state should be assured. Basing on the two points, a concrete way of calculating the energy of the (1s)23p configuration by using the Variation method is given out. The process of the calculation is object. The result accords with experimental data.