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1answer
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Darwin term and Zitterbewegung
I've noticed that in the discussion of the fine structure of Hydrogen atom standard QM texts claim that the Darwin term, which corrects energy of $\ell=0$ (or $s$-) states only, is related to the ...
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3answers
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In solving the hydrogen atom, how to see intuitively in advance that the spin effects to the energy spectrum can be ignored?
When the hydrogen atom is solved in QM books spin is usually ignored because its effect is to add tiny piece to the energy. My question is, is there a way to see this in advance, to see that if we ...
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Atomic Coherence(Polarization) of Two Dipole-Dipole Coupled Atoms
My question is about generalization of most simple problem in semi-classical quantum optics. Composite system of two-level systems.
single system's diagram
where atomic frequency: wab=wa - wa; ...
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0answers
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Wondering about what would happen if all the atoms in the univerise scatter into proton and neutron? [closed]
What if the all the atom in the universe scatter into proton and neutron?In another word, would the all the matter in the universe disappear?
Inspire by the answer of one of my question: A question ...
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4answers
189 views
How can we be sure about the constancy of atomic clocks as in the Hafele and Keating time dilation test?
Atomic clocks were used in Hafele and Keatings experiment which supposedly helped to prove time dilation.
Time Dilation Proof - Hafele and Keating
How can we be sure other forces didn't act upon the ...
3
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1answer
312 views
Why and how is nondegenerate perturbation theory used for time evolution under $\vec{L}.\vec{S}$ coupling?
Let us say that we start with an electron which is in a spin up state and has a spatial wave-function of the form $xf(r)$. Then one turns on a perturbation of the form ...
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5answers
439 views
What do we actually mean when we say that matter is a wave?
What do we actually mean when we say that matter is a wave?
What does the wavelength of this matter wave indicate?
The idea of a particle behaving like a wave is kinda incomprehensible to me.
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1answer
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What is electron momentum density in solids and molecules?
Can someone kindly help me to know how can i get electron momentum density for one orbital like home?
what is the theory of electron momentum density? how can I derive electron momentum density from ...
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2answers
390 views
Is there a list of all atomic electron state transitions and the corresponding radiation emitted?
Here's a quote from Wikipedia:
As an example, the ground state configuration of the sodium atom is 1s22s22p63s, as deduced from the Aufbau principle (see below). The first excited state is ...
4
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3answers
335 views
What keeps particles in an atom from flying away or falling into the nucleus?
In atoms, what force or charge, etc. keeps particles from flying away or into their nucleus? is there a kind of weak-force at work on the atomic scale?
Note I am aware the particle positions are ...
5
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4answers
356 views
Intrinsic structure of electron
The electron contains finite negative charge.The same charges repel each other.What makes electron stable and why does it not burst? Is it a law of nature that the electron charge is the smallest ...
4
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1answer
172 views
Why is Mosely screening in heavy atom K-shell 1 unit?
The Wikipedia article on Moseley's law seems to show that the screening of heavy atoms is by 1 electron charge exactly (in the limit of large Z, experimental precision, within nonrelativistic limits, ...
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1answer
452 views
Why are noble gases used for lights?
I know that neon is used in advert signs due to its inertness. However, I am not entirely sure how the inertness is exploited. I think it is because Ne being inert means that after electricity frees ...
