Quantum Mechanics

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Questions related to Quantum Mechanics

How to deduce the photon description of an arbitrary electro-magnetic field ?

Hi all, This is a question I have been wondering about for a long time (pure curiosity). I would like to know how one can deduce from an arbitrary electro-magnetic field the quantum...

04 April 2016 9,891 7 View

Which is the true Nature of time in Quantum Mechanics ?

Inherent probabilistic nature of measurement in QM seems to impose a distinction between past and future and so a definite direction of time, similar to that occurred in statistical mechanics....

04 April 2016 614 4 View

Force behind the symmetry and pattern ??

Force behind the symmetry and pattern specifically of stars in space, crystals in molecules and particles in atom is the same, alike wise ?? What is concept of natural geometry ?? Do stars and...

04 April 2016 9,060 15 View

Nature of time in QM ?

Inherent probabilistic nature of measurement in QM seems to impose a distinction between past and future and so a definite direction of time, similar to that occurred in statistical mechanics....

04 April 2016 2,849 3 View

What is actually the quantum tunneling??

is it just the interaction between two electronic clouds for very short interval of time?? or electron leaves its electronic cloud to become the part of other during interaction?

04 April 2016 9,528 10 View

What is the correct spin multiplicity of Co2+ cation in a QM simulation?

My system consists of a hydroxide anion coordinated between two divalent cations (Zn2+ or Co2+) and two negatively charged amino acids.I think that the charge and multiplicity for the Zinc system...

04 April 2016 3,726 1 View

Where can I find a place with high computational resources for molecular modeling in Egypt ?

Docking with QM/MM methods often improves the accuracy of the calculation substantially, and designing of a transition state analogue as enzyme inhibitor implies the determination of the...

04 April 2016 5,395 7 View

Why does there have to be something(higgs field) that gives other things mass?

I often hear people say that the Higgs field gives things mass. How can I understand that with out going deep in quantum mechanics, field theory, and the standard model? thanks in advance,

04 April 2016 8,718 22 View

Where can I find a place with high computational resources for molecular modeling in Egypt ?

Docking with QM/MM methods often improves the accuracy of the calculation substantially, and designing of a transition state analogue as enzyme inhibitor implies the determination of the...

04 April 2016 8,032 9 View

Is the methodology of LIGO gravitational waves (GW) discovery right?

1. LIGO did not observe directly the interference pattern which is computer simulation. 2. This simulation is based on the proposition that one beam is getting longer and other is getting shorter...

01 April 2016 2,946 49 View

Does the energy of the photon change in Beth 1936 experiment?

When a left (right) polarized photon reflects from a birefringent plate it changes its polarization to right (left). The internal orbital momentum of the photon thus changes by 2hbar. The orbital...

30 March 2016 4,336 8 View

Quantum mechanics: Tradeoff of nonlocality and contextuality?

With reference to the findings recently reported in http://phys.org/news/2016-03-features-quantum-mechanics.html I have couple of queries and will appreciate if anyone can clarify it. The site...

21 March 2016 9,248 16 View

Is there a relationship between the detector time-window and the width of the energy distribution of a particle?

What is the meaning of the uncertainty relation ΔE Δt ≥ ħ during the energy measurement of a particle? My understanding is that Δt should be the time-window of the detector. But I am not sure....

13 March 2016 7,947 4 View

Can anyone tell me how to calculate boltzmann population (% population) from quantam mechanical approach?

I have crystal structure of porphyrin complex.but as there may be other conformations also possible in the solution. I need to calculate % population of different conformations by changing the...

11 March 2016 4,012 1 View

Fermi level changes with applied electric field?

Hi people, I dont understand why when we apply the electric field to the metal Ef remains the same. Ef as translation energy of electrons remains the same but we accelerate the electrons with...

10 March 2016 7,165 4 View

Is it necessary to use more than one explicit water molecule to study the hydrolysis mechanism?

We have tried to study a hydrolysis mechanism using Gaussian 09 programme for a trans platinum complex both in gas as well as in solvent medium. In this study, we have used only one explicit water...

06 March 2016 2,257 4 View

Is there a relationship between the detector time-window and the width of the energy distribution of a particle?

03 March 2016 1,564 4 View

Why and How Quantum Mechanics being nonlocal while Lorentz Invariant?

Is it just at the act of observation that the values of a variable (or its probability) that is being nonlocal while the "undisturbed" dynamics of the quantum particle is the one that obeys...

03 March 2016 9,241 2 View

How can I get brillouin zone of monoclinic lattice?

Hello,, I'm a starter of Material calculations I have a crystal with P21/M (Monoclinic) symmetry group a = 10.5066, b=3.9764, c=5.9548 alpha = 90.00, beta = 96.9631, gamma = 90.00 According to...

03 March 2016 7,596 0 View

What is double way of unification in Physics?

Prof.Hawking says that Theory of Everything is possible in two ways. what are they?. I think unifying four interactions or unifying quantum mechanics and general relativity. Is this correct?.

03 March 2016 3,621 8 View

What is explicit form of retarded Green's function for d'Alembert eq. in (2+1)-dimensional space-time?

I am trying to derive retarded potentials or retarded Green's function for d'Alembert eq. in (2+1)-dimensional space-time. In the literature I encounter two distinct approaches, one...

03 March 2016 9,273 3 View

Can anyone tell me how to calculate boltzmann population (% population) from quantam mechanical approach?

I have crystal structure of porphyrin complex.but as there may be other conformations also possible in the solution. I need to calculate % population of different conformations by changing the...

03 March 2016 9,741 1 View

How to interpret lambda diagnostic in gamess TDDFT calculation..?

I would like to know the relationship between oscillator strength and the lambda diagnostic since those two factors do not behave as the same for a possible excitation . Thank you.

03 March 2016 1,278 2 View

Quantum mechanics: Tradeoff of nonlocality and contextuality?

With reference to the findings recently reported in http://phys.org/news/2016-03-features-quantum-mechanics.html I have couple of queries and will appreciate if anyone can clarify it. The site...

03 March 2016 1,507 16 View

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