Particle in a box, Harmonic Oscillator, and the Rigid Rotor.
Comprehensive and Accurate Coverage of Quantum Chemistry Fundamentals quantum chemistry lecture notes pdf verified
Look for the PDF titled "Lecture Notes on Quantum Dynamics." If it contains the derivation of the Trotter formula, it is likely the verified 2018-2022 version. Particle in a box, Harmonic Oscillator, and the Rigid Rotor
Quantum chemistry is founded on several bedrock concepts that deviate from classical physics: Wave-Particle Duality Particle in a box