## Scientists Measure Magnetic Interaction Between Two Bound Electrons 26

Posted
by
Soulskill

from the less-than-fridge-magnets dept.

from the less-than-fridge-magnets dept.

An anonymous reader writes

*In a paper published in**Nature*(abstract), scientists report successfully measuring the magnetic interaction of two bound electrons of two different strontium (Sr) ions. The two ions were suspended in a quadrupole ion trap (a.k.a. a Paul trap), and the effects of ambient magnetic noise were mitigated by 'restricting the spin evolution [of the electrons] to a decoherence-free subspace that is immune to collective magnetic field noise.' The scientists measured the magnetic interaction of the two electrons as a function of distance and found that the force acting between the two was inversely dependant on the cubed distance between the electrons, consistent with Newton's inverse-cube law.
## Re: (Score:3)

What's your point?

There is a lot of stuff not everyone knows.

Should we only study things everyone already knows?

Should news only be reported if everyone already knows?

## Re: (Score:1)

Newton's inverse-cube law is still valid. That's good news.

## Newton's ???? inverse cube law (Score:2)

## Re: (Score:2)

Probably about equal, but Einstein couldn't have done his work without the foundations built by Newton. Of course, Newton.... Kepler... Tyco Brahe... "and so proceed ad infinitum"

## Re: (Score:2)

This is not stuff everyone knows.

If Slashdot only told me things I already knew, I wouldn't come here. Duh.

There was enough there to understand the gist of it

Perfect. That's exactly what I want from a Slashdot summary. Then, if I want to read further, I can.

## Ingress is unclear: not inverse cube force (Score:3, Informative)

From ingress

"the force acting between the two was inversely dependant on the cubed distance between the electrons"This should not be understood as inverse cube force between the electrons. From article:"By varying the separation between the two ions, they were able to measure the strength of the magnetic interaction as a function of distance – confirming the expected inverse-cubic (1/d3) dependence of the interaction."It is the strength of the interaction that is found to be inverse cubic. The strength of magnetic force is inverse quadratic. If somebody found evidence of an inverse cubic force then this would be evidence of higher-spatial dimensions and very unexpected indeed. There has been speculation that gravity might be higher-dimensional at very small scales, but I have never heard anyone make this claim of of electromagnetic forces. The cross-product nature of the electric/magnetic interaction makes these forces a true child of an 3 dimensional space.

## Re: (Score:3)

Just to clarify... by interaction do you mean the sum of forces?

If so; are the constituent forces well known, or can they be deduced from the known forces and the total interaction?

## Ingress is unclear: not inverse cube force (Score:1)

Most (if not all) of these findings are derivable from a well forgotten completed theoretical and experimental work on hydrodynamics by Prof. C. A. Bjerknes extended his son Vilhem Bjerknes. The problem is though that in the contemporary research all these "old" theories are not even looked, not to mentioned considered as viable, for their base on the idea about Ether, that somehow is crippling back in to the mainstream science ( willingly or not) although in somehow different form ( black energy or matter,

## Re: (Score:3)

It is the strength of the interaction that is found to be inverse cubic. The strength of magnetic force is inverse quadratic. If somebody found evidence of an inverse cubic force then this would be evidence of higher-spatial dimensions and very unexpected indeed.

How did you get modded informative? The magnetic component of the force between electrons in this case is indeed proportional to the inverse cube of the distance. Elementary magnetostatics, since it's the interaction force between two magnetic dipoles (look up dipole-dipole interaction if you want to see the formula). No higher dimensions or other mumbo jumbo required.

## soo close.. (Score:1)

Gravity is also inversely proportional.... we are so close to figuring out how everything really works, but will probably not happen in our life times :(

## Re: (Score:2)

## Re: (Score:2)

gravity is unlike any other force, there is no way to reconcile a force carrying particle for gravity with observation, hence the Standard Model does not include gravity. Gravity defies quantum mechanics and general relativity. we are far, far away from having any useful theory for gravity

## Re: (Score:1)

I keep holding on the old inversely proportional rule, it's HAS to be clue that gravity is some extension of electro-magnetic force, but IANAP....

## Neat (Score:5, Interesting)

Neat! Newtonian physics at the atomic level. Does anyone know if the inverse square law has been tested in other ways at this scale? Or other Newtonian laws?

## Science! (Score:3, Insightful)

## Observing two spins IS the big technological leap (Score:3, Informative)

## Fucking magnets, how do they work ? (Score:2)