Atomic system

An atomic system is a physical system made of atoms or their constituent particles, described by their interactions and quantum states.

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Quantum state: A mathematical description that encodes the possible outcomes of measurements on a quantum system. Specifies the system's possible configurations and measurement outcomes.
Electromagnetic interaction: The fundamental interaction between electrically charged particles and electromagnetic fields. It binds electrons to nuclei and governs most atomic structure.
Atomic clock: A clock that measures time using a stable transition frequency in atoms. Atomic transition frequencies provide exceptionally precise time standards.
Classical mechanics: The theory describing motion through definite positions, momenta, and trajectories. Its trajectories do not capture atomic quantization or superposition.
Hamiltonian: An operator representing a system's total energy and governing its time evolution. Encodes the interactions and energies that determine the system's states.
Schrödinger equation: The equation governing the time evolution of nonrelativistic quantum states. It predicts how atomic wave functions evolve under a specified Hamiltonian.
Laser cooling: Methods that reduce the motion of atoms by using the momentum of light. Cooling produces slow, controllable atomic samples for experiments.
Quantum field theory: A framework that treats particles as excitations of quantum fields. It extends particle-based atomic descriptions to creation and annihilation processes.
Wave function: A complex-valued function that represents the quantum state of a system in a chosen representation. Provides a spatial representation of atomic particles and their probability amplitudes.
Pauli exclusion principle: The rule that identical fermions cannot occupy the same quantum state simultaneously. It organizes electrons into distinct states within atoms.