Tagged Questions
4
votes
1answer
121 views
Stark Effect on the 1st excited state of Hydrogen
I know the ground state of hydrogen is unaffected by the Stark effect to first order. And I also know that the 1st excited state is split from 4 degenerate states to 2 distinct, and 1 degenerate state ...
0
votes
0answers
19 views
Degeneracy of orbitals in magenetic field
Why is that in an external magnetic field(uniform) the degeneracy of d,f orbitals is lost but the degeneracy of p orbitals remain intact assuming the main cause of losing degeneracy is the difference ...
1
vote
1answer
84 views
Finding the wavelength of an electron in its ground state?
To find the wavelength of an electron in its ground state in a hydrogen atom, would I or could I do the following?
Use the ground state energy (-13.6eV) in $E^2 = m^2c^4 + p^2c^2$
Solve for $p$
Use ...
1
vote
1answer
159 views
Two photons transition
if an atom in its ground state is coupled to an electromagnetic field it can absorb a photon if the EM field contains one with the right frequency. These transitions depends on $⟨f|H_i|i⟩$ (from ...
0
votes
0answers
30 views
Thermionic emission, delayed emission and predissociation
In molecular photodissociation, the thermionic emission, delayed emission and predissociation are the same? otherwise, what is the difference between them?
My question is not about the solids, but I ...
-1
votes
1answer
56 views
How is a Rydberg Blockade Radius defined?
Rydberg blockade is a phenomena in 3 or more level systems of Rydberg dressed atoms.
0
votes
0answers
33 views
Where can I find the Bohr Sommerfield condition?
I need to solve the Hydrogen Atom using the phase integral [Bohr Sommerfield Condition] but I don't know where can I find it. Help me please!
1
vote
0answers
49 views
Where do electrons get the energy to remain in orbit? [duplicate]
As we know electrons continuously revolve around the nuclus without falling in it at a high velocity beating it's force of attraction. My question is where do electrons get energy to revolve around ...
2
votes
2answers
57 views
Optical trapping problem
Can we make light slower by applying optical trapping (I mean applying laser beam to lower the speed of light)?
1
vote
0answers
94 views
What is the height of the electron orbits of atom?
What is the height of the electron orbits an atom? (How far are the energy levels of the electron relative to the center of the atomic nucleus?)
How fast do electrons move in their orbits?
4
votes
3answers
141 views
Do electrons in multi-electron atoms really have definite angular momenta?
Since the mutual repulsion term between electrons orbiting the same nucleus does not commute with either electron's angular momentum operator (but only with their sum), I'd assume that the electrons ...
0
votes
1answer
79 views
Optimal methods for mapping out molecules, atoms and nuclei and their energy levels?
I'm wondering if it would be possible to map out all the different types of molecules, atoms and nuclei and their energy levels on one page (even if in a generalised way)? But perhaps I'm referring to ...
1
vote
0answers
93 views
General question on aligning a quantization axis
I have a general question on how to work with quantization axis. Here is the setup:
I am looking at a single two-level atom placed at the origin $(0, 0, 0)$, which is unperturbed in the sense that ...
3
votes
1answer
126 views
Spin-orbit coupling constant for rubidium
I have come across the following question in my course notes:
The $5s\to 5p$ transition in rubidium is split into two components with wavelengths of 780nm and 795nm respectively. For the $5p$ state, ...
1
vote
1answer
97 views
About Efimov States and Halo-Nuclei
I read that
Halo nuclei could be seen as special Efimov states, depending on the subtle definitions. (The last sentence in the second to last paragraph of this Wikipedia article.)
This does ...
3
votes
0answers
117 views
What is the Landé g factor?
What is the Landé g factor?
I know that it gives the relation between magnetic moment and angular moment, but i wanted to know why are those magnitudes related to each other and why is the magnetic ...
2
votes
3answers
335 views
Disproving a refutation of quantum mechanics (QM) via a calculation of the ground state of the helium atom
This website http://www7b.biglobe.ne.jp/~kcy05t/ appears to refute Quantum mechanics using some proof.
An important paper involved is this 'Calculation of Helium Ground State Energy by Bohr's ...
2
votes
2answers
239 views
How robust is Kramers degeneracy in real material?
Kramers theorem rely on odd total number of electrons. In reality, total number of electrons is about 10^23. Can those electrons be so smart to count the total number precisely and decide to form ...
4
votes
1answer
80 views
What are relativistic and radiative effects (in quantum simulation)?
I'm reading about Quantum Monte Carlo, and I see that some people are trying to calculate hydrogen and helium energies as accurately as possible.
QMC with Green's function or Diffusion QMC seem to be ...
3
votes
1answer
547 views
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 ...
1
vote
3answers
140 views
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 ...
0
votes
0answers
103 views
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; ...
3
votes
1answer
314 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 ...
4
votes
5answers
440 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.
...
4
votes
3answers
340 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
votes
4answers
358 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 ...
