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Definitions for "Population Inversion"
Keywords:  lasing, inversion, excited, elctrons, higer
Related Terms: Statistical mechanics, Quantum mechanics, Uncertainty principle, Quantum, Quantum theory, Excited state, Planck's constant, Fermi energy, Hamiltonian, Energy level, Excited atom, Wave function, Orbital, Heisenberg uncertainty principle, Planck constant, Mass spectrometry, Virtual particle, Exclusion principle, Quantum numbers, Wavefunction, Pauli exclusion principle, Sample, Annihilation, Binding energy, Ground state, Bohr model, Molecular orbital, Supersymmetry, Fundamental interaction, Boson , Molecular mechanics, Isotope , Quantum dot, Random sampling, Simple random sampling, Isotopes, Bohr atom, Hund's rule, Basis set, Electron shell, Parameter, Random sample, Excitation, Principal quantum number, Particle count, Energy levels, Standard model, Quantum chromodynamics, Probability sample
A state in which a substance has been energized, or excited, so that more atoms or molecules are in a higher excited state than in a lower resting state. This is necessary prerequisite for laser action.
laserstars.org
Normally the number of atoms at high energy level(E1) is less than those in low energy level(E1), N2(E2) N1(E1). If N2N1, we say population inversion exists, which is a necessary condition for lasing.
supergassaver.com
The state of a group of atoms or molecules a large number of which are at an elevated energy state, as opposed to their stable ground state. The lasing medium must be in this state for lasing to occur.
exatron.com
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