Addition of a discrete amount of energy to a system that changes it usually from a state of lowest energy (ground state) to one of higher energy (excited state). For example, in a hydrogen atom, an excitation energy of 10.2 electron volts is required to move the lone electron from its ground state to its first excited state. The excitation energy stored in excited atoms and nuclei is usually emitted as ultraviolet radiation from atoms and as gamma radiation (see gamma ray) from nuclei as they return to their ground states
The condition in which an electron moves to a higher, unstable energy level upon absorbing light
One of the responses caused by specific neurotransmitters binding to receptors on a neuron Excitation increases the probability that neurotransmitters will be released by the neuron
something that agitates and arouses; "he looked forward to the excitements of the day" the neural or electrical arousal of an organ or muscle or gland
The act of creating magnetic lines of force from a motor winding by applying voltage
something that agitates and arouses; "he looked forward to the excitements of the day"
The process of imparting to an atom or an ion an amount of energy greater than it has in its normal or least energy state
The addition of energy to a system, thereby transferring it from its ground state to an excited state Excitation of a nucleus, an atom, or a molecule can result from absorption of photons or from inelastic collisions with other particles