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Material consists of
molecules, molecules from atoms. In fact the composition of atoms is not
the smallest particles of matter, it is by the nucleus and the nuclear
spin around the group consisting of a micro-electronic system. The track
is a set of rotating concentric garden space. Concentric Park, a
limited number, in addition to allowing the track, other tracks do not
allow electronic presence.
Atoms with internal energy, internal energy change of size can not
be a continuous, step by step separate. This separation of energy called
the energy levels. Electronic state in which the level of the decision
level. Under normal circumstances, the electronic is always located in
the inner track, this state is called the ground state or the
steady-state. Atomic system in the whole group is always the vast
majority of electronic ground state. In the absence of external force,
the inner up electronic will not flow to the outer layer. In other
words, low energy level on the electronic energy level does not
automatically go up.
When the electronic ground state by external used to give a certain
energy in an appropriate manner, such as light, electron impact,
chemical reaction or heating and so on, will be excited to high energy
level up. Instead of electronic due to atomic own internal
contradictions will spontaneously return to lower energy levels up, this
process is called spontaneous transitions. Transition refers to the
micro-particle system from a particular state to do a state of
transition. Spontaneous transition within the atom, can reduce the time,
and the excess energy will be released. Released in two forms, one is
hot, one is light. Heat is called non-radiative transitions, the light
is called spontaneous emission transition, the spontaneous emission of
radiation that the general light source, such as lamp light is generated
by spontaneous transitions.
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