What Is the Difference Between Atoms in High and Low Fields?

AI Thread Summary
The discussion focuses on defining high and low fields in the context of atomic behavior under external influences. High fields are characterized by their strength being comparable to the Coulomb field from the nucleus, causing energy level mixing and significantly altering ionization thresholds. The conversation also touches on electromagnetic radiation, where high fields can lead to multi-photon processes becoming significant. The terms strong and weak are also used interchangeably with high and low fields. Understanding these distinctions is crucial for exploring atomic interactions in varying field strengths.
SUN Qian
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I don't quite understand the defination of the high field. What is the difference between atoms in down field and high field? THANKS~
 
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What kind of field? Electric or magnetic? Constant or time varying?

Several definitions of strong fields are possible.

One might be that the strength of the applied field is the same order of magnitude as the Coulomb field from the nucleus.

Another might be that the externally applied field causes energy level mixing from adjacent principal quantum numbers.

Another might be that the ionization threshold of the atom is significantly changed.
 
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SUN Qian said:
down field and high field
By the way, the converse of high field is low field. Strong and weak are also used.

To add to what Dr. Courtney said, in the case of EM radiation, high fields can correspond to cases where multi-photon processes become important.
 
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DrClaude said:
Buy the way, the converse of high field is low field. Strong and weak are also used.

To add to what Dr. Courtney said, in the case of EM radiation, high fields can correspond to cases where multi-photon processes become important.

Thanks for correcting my mistake :)
 

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