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Figure 40-25 is an energy-level diagram for a fictitious three-dimensional infinite potential well that contains one electron. The numbers of degenerate states of the levels are indicated: 鈥渘on鈥 means non-degenerate (which includes the ground state) and 鈥渢riple鈥 means 3 states. If we put a total of 22 electrons in the well, what multiple of h2/8mL2gives the energy of the ground state of the 22 electron system? Assume that the electrostatic forces between the electrons are negligible.

Short Answer

Expert verified

The multiple of h2/8mL2that gives the energy of the first excited state of the 22 electron system is 186.

Step by step solution

01

The given data:

A total of 22 electrons are put in the fictitious potential well system that contains one electron and levels like non-degenerate, states, and three states.

02

Understanding the concept of spin degeneracy:

Spin degradation "here means that each level of energy is able to capture the electron spin-up and the electron spin-down, i.e. in each orbital there are two distinct spinning regions (some may call these spins orbitals).

Considering the concept of electron accommodation and spin degeneracy which is Pauli's exclusion principle, we can get the number of electrons in each energy level at the ground state. Due to spin degeneracy, each state can have two electrons. For the case being 2 electrons in the ground state, 6 electrons in the triplet state, and 2 electrons in the non-degenerate states, we can get the total energy of the system.

03

Calculation of the multiple of h2/8mL2for the ground state

Thus using the concept of spin degeneracy ms=12for a 22 electron system, the number of electrons in the ground is 2, the triple-state is 6, the higher triple-state is 6, another 6 in the next higher triple-state, and finally the last two electrons in the no-degenerate states. From figure, the energy values of each state are given as:

Eground(E1)=3h28mL2

Etriple(E2)=6h28mL2Etriple(E3)=9h28mL2Etriple(E4)=11h28mL2Enon-degenerate(E5)=12h28mL2

Thus, the total energy of the 22 electron system for the ground state is given as follows.

localid="1661505572735" Eground,total=2E1+6E2+6E3+6E4+2E5=23h28mL2+66h28mL2+69h28mL2+611h28mL2+212h28mL2=186h28mL2

Hence, the value of the multiple is 186.

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