Advanced Quantum Mechanics
Effect of Strong & Weak Magnetic field on Atom
Dr Masood Yousaf
Zain-ul-Abdin bsf1800387
BS-PHY (Eve)-VII
Division of Science & Technology
University of Education Township, Lahore

Magnetic field of Atom (Binternal)
As the orbiting electrons are moving charges (just like current flowing through
a circuit), generates a magnetic field. This magnetic field has a specific
direction (given by right hand rule as for solenoid
Binternal
µl Anti-P L
µs Anti-P S

Magnetic Dipole in magnetic field
torque= µ x B
E= -µ .B
Interaction energy When B is applied on atom the L also
changes due to change in µ

Atoms in Magnetic Field (B is weak/strong)
Normal Zeeman Effect
Anomalus Zeeman Effect
(B is weak)
Paschen Back Effect (B is strong)
(Bint > Bext)
(Bint < Bext)