Incandescence and electronic excitation

  • A
  • Thread starter hokhani
  • Start date
  • #1
443
7

Main Question or Discussion Point

As far as I experienced, incandescence happens in a wide variety of materials no matter what a substance (conductor, insulator and so on) is. Does this effect is related to the electronic excitation? Could anyone please explain the reason of this effect?
 

Answers and Replies

  • #2
DrClaude
Mentor
7,147
3,281
At equilibrium, the thermal energy is spread out into all degrees of freedom that are not "frozen" (i.e., for which there is enough energy to lead to a significant population of the excited states). For high enough T, that includes electronics degrees of freedom. In the solid state, electronic states usually constitute continua, such that emission is over a wide range of the electromagnetic spectrum.

You should look up blackbody radiation.
 
  • #3
443
7
At equilibrium, the thermal energy is spread out into all degrees of freedom that are not "frozen" (i.e., for which there is enough energy to lead to a significant population of the excited states). For high enough T, that includes electronics degrees of freedom.
In an ideal insulator electrons can not pass the large gap by thermal energy and so there is no electron excitation. How does an insulator show this effect?
 
  • #4
DrClaude
Mentor
7,147
3,281
States are populated with a probability proportional to ##e^{-E/kT}##. There is always some thermal electronic excitation, even though it can be neglected in most cases. But there is always a point where the temperature is high enough that it is not negligible anymore, and the object will glow.
 

Related Threads on Incandescence and electronic excitation

  • Last Post
Replies
19
Views
3K
Replies
3
Views
5K
Replies
11
Views
2K
Replies
0
Views
1K
Replies
5
Views
9K
  • Last Post
Replies
1
Views
552
  • Last Post
Replies
1
Views
650
  • Last Post
Replies
5
Views
2K
Replies
1
Views
2K
  • Last Post
Replies
1
Views
646
Top