Questions tagged [electrons]

Negatively charged particle with spin 1/2. A component of mundane terrestrial matter, and part of all neutral atoms and molecules. It has a mass about 1/1800 that of a proton. Its antiparticle is the positron.

Filter by
Sorted by
Tagged with
3
votes
1answer
64 views

How can electrons and quarks be composite?

There are theories suggesting that the electrons and quarks are not elementary particles, but instead are composite particles of two or more yet undiscovered elementary particles. However ...
-1
votes
1answer
15 views

What defines a material is an anode or a cathode?

How to know if a material is an anode or cathode? and if i connect an anode and a cathode will it be a diode? Like the pensil razor diode, if it worked not because of that, how does it work?
0
votes
0answers
25 views

What are the deciding criteria for occuring of reflection, absorption, Emission, refraction and burning? [on hold]

Why does some objects reflect, refract, absorb, emit and burn, when electromagnetic wave is thrown on them? I want to know all these things at atomic and molecular level.
0
votes
2answers
51 views

How can the annihilation of an electron and a positron create a quark-antiquark pair or a muon-anti muon pair?

The overview of this interaction is that a positron and an electron annihilate with each other and create two gamma photons which contains too much energy and soon materialise into a quark-anti quark ...
2
votes
0answers
24 views

Eigenstates in a 2D metal disk with finite-size perpendicular magnetic field (Piece-wise Gauge)

Let's have a two-dimensional metal disk with radius R, and now I apply a uniform magnetic field B perpendicular to the disk, within the concentric part of the disk with radius r $\lt$ R. How can we ...
0
votes
1answer
26 views

Property of the time evolution operator preserving the norm of the wavefunction

Since the time evolution unitary operator preserves norm, if applied to any system say electron whizzing around its orbitals, no matter what time we consider would it always have the same probability ...
4
votes
4answers
94 views

Frequency of light versus frequency of electron vibration

I've been trying to understand photons and light, although entirely conceptually (layman with not much of a background here, but I really want to understand this a bit better) and there's a couple of ...
0
votes
0answers
27 views

What exactly is a coefficient of friction due to electron stopping?

To be more specific, I am looking to understand what electron stopping is and how I could possibly define a coefficient of friction due to electron stopping. I am running MD simulations using LAMMPS ...
3
votes
2answers
47 views

Treatment of electrons and phonons in condensed matter physics

I was watching the lectures by steve simon(oxford) on solid-state physics. In the course, he derived the dispersion relation for phonons(assuming spring between atoms) and dispersion relation for ...
0
votes
0answers
23 views

What is the meaning of 'sputtering' in Ion pumps

So after reading a few articles this is what I understand: Air enters the pump through diffusion In the pump there is a cloud of electrons between two (grounded) cathodes As soon as an electron hits ...
1
vote
1answer
41 views

What is occurring inside the lattice structure of metal when compression happens?

I was browsing reddit and saw this post. It is a gif of a factory, with a huge press squashing a hot chunk of metal. I'm specifically interested in the behavior that is happening after the initial ...
1
vote
1answer
82 views

The mean free path of electrons in high vacuum is 26 billion kilometres?

I used this formula to calculate the mean free path length of an electron in high vacuum. $$\lambda = \frac{k T}{\sqrt{2}\cdot4\pi r^2 \cdot p}$$ where k is the Boltzmann konstant, T the temperature ...
0
votes
2answers
57 views

Does a relaxing electron really accelerate?

This is not a duplicate. I am not asking about quantum leaps or quantum jumps or whether the transition is instantaneous (yes I asked that question before here Do electrons really perform ...
-1
votes
1answer
45 views

Query about Heisenberg uncertainty principle

acoording to heisenbergy uncertainty principle if the electrons change the radius of their orbit, then it is like making transition even though the change in radius is small and they should emit ...
0
votes
0answers
11 views

What is the nature of the multipoles used to shape/re-direct an e-beam?

Imagine having an electron beam, just like in an electron microscope. Now imagine that we have some multipoles prepared in the beams path to influence the shape/path of the beam. My question is: ...
13
votes
1answer
332 views

How did we know that the Dirac equation describes the electron but not the proton?

I'm suddenly getting confused on what should be a very simple point. Recall that the $g$-factor of a particle is defined as $$\mu = \frac{ge}{2m} L$$ where $L$ is the spin angular momentum. For any ...
0
votes
1answer
27 views

How would a electrostatic lens accelerate a continuous beam of electrons?

Truthfully, I am somewhat confused by this topic. Electro-magnetic lenses are created by coils, through which one runs a current, which then in turn generates a magnetic field whose field lines are ...
0
votes
0answers
18 views

Electrons' distribution inside bands

If you consider a crystal of silicon made by $N$ atoms, you know that there will be a valence band with $4N$ possible levels of energy for electrons and a conduction band with $4N$ possible levels of ...
0
votes
1answer
31 views

Difference between discharge tube and capacitor

I did search this on google but didn't get satisfactory results. Can you tell me difference between capacitor and discharge tube? "**Discharge tube has its gaseous medium at very low pressure but ...
1
vote
1answer
42 views

In non-technical terms, how does the scanning electron microscope function?

I've watched a few videos like this one and know the basic structure. We have an e-source, an anode which pulls electrons out, then a condenser which starts to focus all beams, scanning coils and ...
0
votes
0answers
78 views

Massless electrons? [closed]

I've been researching the Higgs Boson for a while now, and I just can't stop thinking about the idea of removing the Higgs Field from a certain space. I saw another question that answered this, saying ...
6
votes
3answers
202 views

Are electromagnetic waves only caused by accelerating charges?

Like the title says, are electromagnetic waves only caused by accelerating charges? Are there any other methods for the generation of photons? If electromagnetic waves are ONLY able to be created by ...
8
votes
1answer
1k views

Is there a magnetic attraction between two parallel electron beams?

I am refering to Ampere's force law, and to the beams accelerated after the cathode, so the deflection is not due to their respective cathode. In other words, do two electrons accelerating parallel to ...
0
votes
1answer
22 views

Identity reversing event

I'm a master student in mathematics currently taking Quantum Mechanics and since the lecture notes provided by the lecturer aren't cutting it I'm reading "Quantum Mechanics and Path Integrals" by R. ...
1
vote
1answer
26 views

Is the falling back to ground state of an electron what makes the electromagnetic wave, or is it the action of absorption AND falling down?

When an electron absorbs a photon, there it accelerates and thus it creates a kink in its electric field. Then, when it falls down to its normal state, it creates another kink. Here are my questions. ...
2
votes
1answer
75 views

What is the magnetic field of a radially moving current?

Let's say free electrons are contained in a small cloud because of electrostatic forces confining them. Now, if those walls vanish, the cloud will expand very fast because of the coulomb force ...
0
votes
0answers
30 views

Are electrons in a singlet state still electrons?

Given that some interactions such as electron capture make the electron "disappear" and the output fermion is a neutrino, I wonder what is the rationale behind saying that in the case of two opposite ...
0
votes
3answers
64 views

Do electrons in the same orbital but different spin feel each other's Coulomb repulsion?

Or is it irrelevant, as orbitals are QM while Coulomb interactions are classical physics? What I think I understood of orbitals is that particles with the same quantum numbers cannot occupy the same ...
0
votes
0answers
5 views

Does an electron spin axis form a characteristic angle with the direction of its translation?

I looked everywhere I could think of but found no connection between the orientation of the spin and the motion of the same particle. So maybe there is none. Yet, in the case of an electron being ...
0
votes
0answers
14 views

diamagnetic substances and experimental support of electron configuration

In a basic explanation I have read regarding apparatus used to show the electron configuration of a material's atoms, it states that diamagnetic substances when weighed in the presence of an external ...
0
votes
1answer
65 views

Does $E=mc^2$ apply to electron shells with different energies? [duplicate]

Is this statement true: Each electron shell has a different energy level, with those shells closest to the nucleus being lower in energy than those farther from the nucleus. Mass of electron $= 9....
0
votes
0answers
3 views

Electron spin resonance experiments

Recommend me some good books on ESR. I'm performing an experiment of calculating lande's factor using ESR and I've so many doubts. Please help!
0
votes
2answers
67 views

What is the admissible range of sizes or scales for double slit experiments?

Sometimes, the slits are in the range of nanometers, but I often bump into comments saying you can try this at home with lasers and polarized glass. Recently, I even found clearly macroscopic pictures ...
0
votes
0answers
31 views

How much does the distance between electron orbits shrink as proton number increases?

I was watching a YouTube video that briefly mentioned the electromagnetic attraction between the nucleus and it's electrons increases as the proton count of an atom increases. I'd never considered ...
1
vote
1answer
80 views

Electron spin g-factor

I am reading Schwartz's book on Quantum field theory. In the chapter anomalous magnetic moment (chapter 17) he mentions that Dirac equation naturally implies that the electron spin $g$-factor is 2. ...
1
vote
0answers
21 views

Electron spin resonance

What is the principle of electron spin resonance? I'm performing an experiment in which I've a DPPH(paramagnetic) sample and I'm trying to find out the lande's factor using ESR setup. My problem is I'...
-1
votes
4answers
131 views

Philosophy of Science: Do electrons exist, or are they just models to explain physical phenomena? [closed]

I didn't find any SE site for "Philosophy of Science" hence I am asking it on Physics SE because it is related to Physics more than to Philosophy. As law of gravitation is a model which was proposed ...
0
votes
0answers
12 views

Surface modelization of an electrode

I am trying to model the interaction between an electrode and a saline solution through an RC circuit. A reference electrode is placed in the saline solution to measure the voltage between the ...
2
votes
1answer
61 views

Would wall sockets glow if human eye could see light at 50Hz?

The title is self-explanatory. I know that the electrons at the tip of Live get pushed in and out with respect to Neutral. (You shouldn't say there is no current; since there is air, a poor conductor, ...
2
votes
1answer
116 views

Can an electron be inside a proton?

This article has an image showing the 2S and 2P states of a hydrogen atom. The caption makes the following claim: The 2S and 2P states of hydrogen show where the electron could be found at any ...
0
votes
2answers
65 views

Formation of an electron

I recently asked the question (with title "electron charge") about the negative charge of an electron and I received several answers to tell me that what I had heard about the formation of the ...
0
votes
1answer
52 views

What happens to the extra energy when the photon hits an electron? (+ Compton's Effect)

I understand that the electron needs a specific quantized amount of energy in order to be excited to another state. For example, hydrogen requires $10.2\ \mathrm{eV}$ for its electron to jump from $n=...
4
votes
2answers
164 views

How an ultra-relativistic electron near the speed of light keeps its spin velocity without becoming partially superluminal?

If an electron has spin and volume than the point on the surface is rotating at constant speed according to Planck constant defined angular momentum.If this electron accelerates then this point on the ...
-1
votes
1answer
49 views

Left and right handed electromagnetic radiation from different subatomic particles?

The acceleration of electrons in an antenna rod produces a radio wave with its oscillating electrical and magnetic fields. For a vertically oriented rod the electric field points up- and downwards. ...
0
votes
0answers
36 views

Is the acceleration produced by electrostatic repulsion quantized?

Say the universe at time $t_0=0$ consists of two electrons at rest, both of charge $q$, separated by some distance $r$. The repulsive force $F$ between them is $F = C q^2/r^2$ where $C$ is Coulumb's ...
2
votes
1answer
39 views

Is electron capture partially responsible for matter decay?

Sorry for the very likely ill-posed question. I have lately started reading a lot about quantum physics and the nature of electrons and I read about a phenomenon known as "electron capture" which can ...
1
vote
0answers
38 views

Intuitive explanation why electrons move from low to high electric potential

I know almost nothing about physics but am about to learn some electronics. I have trouble understanding why electrons move from low to high electric potential based on the definition given on the ...
3
votes
1answer
61 views

Can we add the resistivity due to different scattering mechanisms?

Suppose there's a metal in which electrons interact with themselves and with the phonons. The hamiltonian might look like this \begin{equation} H= \sum_{k}\epsilon_k c^\dagger_k c_k + \sum_{k}\...
0
votes
0answers
39 views

Forces in the equilibrium state of a molecule

I'm trying to minimize the energies of hydrogen molecule and lithium hydride molecule with the L-BFGS method and HGH pseudopotential, see arXiv:cond-mat/9803286. Hydrogen molecule works fine but ...
0
votes
0answers
16 views

Meaning of electron displaced to another quantum state in another location

For example, in a p-n junction scenario where the electron is displaced from LOCATION A, due to diffusion to a lower quantum state at LOCATION B in the p-type silicon, as seen in the following diagram ...