Deriving Quantum Numbers from the Schrodinger Equation

In summary, the values of n, l, and ml (principle quantum number, azimuthal quantum number, magnetic quantum number) are obtained by solving the Schrodinger equation for an electron in a fixed potential electrical field, assuming the proton is a fixed point charge. Each of these quantum numbers is an eigenvalue of one of the possible eigensolutions. The process involves solving the radial and colatitude differential equations, which can be found in a full-bore QM textbook such as Merzbacher's.
  • #1
Mandelbroth
611
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Can someone explain to me how one gets the values of n, l, and ml (principle quantum number, azimuthal quantum number, magnetic quantum number, respectively) from the Schrodinger equation for use in chemistry involving distribution of electrons in a hydrogen atom?
 
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  • #2
Mandelbroth said:
Can someone explain to me how one gets the values of n, l, and ml (principle quantum number, azimuthal quantum number, magnetic quantum number, respectively) from the Schrodinger equation for use in chemistry involving distribution of electrons in a hydrogen atom?

Not quickly... The basic idea is easy enough, you just solve the Schrodinger equation for an electron in a fixed potential electrical field assuming that the proton is a fixed point charge; each of these quantum numbers is an eigenvalue of one of the possible eigensolutions.

But the algebraic drudgery involved can (and usually does) fill an entire chapter of a serious undergrad textbook. Very likely someone has a link to a decent online set of lecture notes...
 
  • #3
You can find an overview here (follow the links to subsidiary pages also):

http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/hydsch.html#c2

This is at the level that you might find in a second-year "introductory modern physics" textbook.

If you want the gory details of solving the radial differential equation (which leads through the associated Laguerre polynomials) and the colatitude differential equation (which leads through the Legendre polynomials), you'll have to find a full-bore QM textbook. In graduate school many years ago, I used Merzbacher's book which did that, leaving much of the algebra to the student, of course.
 

1. What are quantum numbers?

Quantum numbers are a set of four values that describe the energy, shape, orientation, and spin of an electron in an atom.

2. How are quantum numbers derived?

Quantum numbers are derived through various mathematical equations and principles, such as the Schrödinger equation and the Pauli exclusion principle.

3. What is the significance of quantum numbers?

Quantum numbers are important because they help us understand the behavior and properties of electrons in an atom, which ultimately determines the chemical and physical characteristics of elements and compounds.

4. What are the four quantum numbers and what do they represent?

The four quantum numbers are:
- Principal quantum number (n): represents the energy level or shell of an electron
- Angular momentum quantum number (l): represents the shape of the electron's orbital
- Magnetic quantum number (ml): represents the orientation of the orbital in space
- Spin quantum number (ms): represents the spin of the electron

5. How do we use quantum numbers to determine electron configurations?

By assigning values to the four quantum numbers, we can determine the arrangement of electrons in an atom's energy levels and orbitals, which gives us the electron configuration.

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