Do molecules have intrinsic magnetic fields?

In summary, according to this expert, molecules have magnetic fields to them, but it depends on the movement and placement of the charges as far as the magnetic fields are concerned. The magnetic fields also change depending on the size and shape of the molecule. The fields are strongest near the nuclei.
  • #1
anorred
59
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Do molecules have intrinsic magnetic fields to them? Let's say you have a water molecule H20. Would the oxygen have a field due to the orientation of it's electrons, and possibly the hydrogens fields act to reduce that field? I'm just curious.
 
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  • #2
anorred said:
Do molecules have intrinsic magnetic fields to them? Let's say you have a water molecule H20. Would the oxygen have a field due to the orientation of it's electrons, and possibly the hydrogens fields act to reduce that field? I'm just curious.

It changes depending on the movement and placement of the charges as far as the magnetic fields are concerned. When looking at water we are seeing the 'average' behavior of the interactions of these fields of a large group of likely very dynamic molecules.
 
  • #3
Well let's say you look at one water molecule. Does it have a magnetic field or does the random interaction of electrons cancel all magnetism out?
 
  • #4
anorred said:
Well let's say you look at one water molecule. Does it have a magnetic field or does the random interaction of electrons cancel all magnetism out?

Once a magnetic field is generated from a moving charge it moves away at the speed of light as an EM wave so unless there is an exactly equal but opposite EM wave emanating at the same time then no.
 
  • #5
There are molecules with a permanent magnetic moment. In most of them it is due to the spin of the electrons, e.g. in many transition metal compounds. There are a few were the orbital moment is responsible for part or all of the magnetic field like in nitrogen-monoxide or singulet oxygen.
 
  • #6
Do molecules have intrinsic magnetic fields to them?

sure

Let's say you have a water molecule H20. Would the oxygen have a field due to the orientation of it's electrons, and possibly the hydrogens fields act to reduce that field? I'm just curious.
sort of, but better to understand the magnetic moments [field orientations] add as vectors;some examples here:http://en.wikipedia.org/wiki/Magnetic_moment#Examples_of_magnetic_momentFundamental particles have intrinsic spin...and an associated magnetic moment
check out

http://en.wikipedia.org/wiki/Electron_spin
 
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  • #7
DrDu said:
There are molecules with a permanent magnetic moment. In most of them it is due to the spin of the electrons, e.g. in many transition metal compounds. There are a few were the orbital moment is responsible for part or all of the magnetic field like in nitrogen-monoxide or singulet oxygen.

Naty1 said:
sure




sort of, but better to understand the magnetic moments [field orientations] add as vectors;some examples here:


http://en.wikipedia.org/wiki/Magnetic_moment#Examples_of_magnetic_moment


Fundamental particles have intrinsic spin...and an associated magentic moment
check out

http://en.wikipedia.org/wiki/Electron_spin

I was wondering when you guys were going to chime in.

Annored, this the the quantum mechanical view of how these molecules behave and is currently the best and most accepted model for the behavior of such structures. What I presented is the classical description which is typically only used for macro systems.

It's a wonderful part of science today and represents a split between two very different types of Physics as experiment shows it seems to 'change' when we zoom in for a closer look at atomic scales.
 
  • #8
Anorred,
you can also some find interesting material in Wikipedia under

http://en.wikipedia.org/wiki/Polar_molecules

Note the first illustration, top right...

And as you may know, microwave heating relies on
...polarized [water] molecules in the food to rotate and build up thermal energy in a process known as dielectric heating.

with a funny story here:

http://en.wikipedia.org/wiki/Microwave_oven#Accidental_discovery

It was in 1945 that the specific heating effect of a high-power microwave beam was discovered, accidentally. Percy Spencer, an American self-taught engineer from Howland, Maine who worked at the time for Raytheon was working on an active radar set when he noticed that a Mr. Goodbar he had in his pocket started to melt — the radar had melted his chocolate bar with microwaves. The first food to be deliberately cooked with Spencer's microwave was popcorn, and the second was an egg, which exploded in the face of one of the experimenters.[6][7] To verify his finding, Spencer created a high density electromagnetic field by feeding microwave power from a magnetron into a metal box from which it had no way to escape. When food was placed in the box with the microwave energy, the temperature of the food rose rapidly.

I wonder how the candy melted before he did...
 

FAQ: Do molecules have intrinsic magnetic fields?

1. What is a magnetic field of a molecule?

The magnetic field of a molecule refers to the area of influence around a molecule where its electrons and atoms interact with external magnetic fields. This interaction can cause the molecule to become either attracted or repelled by the magnetic field.

2. How is the magnetic field of a molecule measured?

The magnetic field of a molecule is measured using a technique called electron paramagnetic resonance (EPR) spectroscopy. This method involves exposing the molecule to a magnetic field and measuring the energy changes that occur in its electrons.

3. What factors influence the strength of a molecule's magnetic field?

The strength of a molecule's magnetic field is influenced by several factors, including the number of unpaired electrons, the distance between these electrons, and the strength of the surrounding magnetic field.

4. How does the magnetic field of a molecule affect its chemical properties?

The magnetic field of a molecule can affect its chemical properties in several ways. For example, a strong magnetic field can cause the molecule to become more reactive, while a weak magnetic field can make it less reactive. Additionally, the orientation of the molecule's electrons in the magnetic field can also impact its chemical behavior.

5. Can the magnetic field of a molecule be manipulated?

Yes, the magnetic field of a molecule can be manipulated using external magnetic fields. This can be done by either increasing or decreasing the strength of the external magnetic field, or by changing the orientation of the molecule in the magnetic field.

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