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By Charles Rhodes, P.Eng., Ph.D.

An isolated spheromak in field free space adopts a single energy state. However, if there is an externally applied magnetic field the energy of the otherwise isolated spheromak becomes a function of the spheromak orientation with respect to the externally applied magnetic field. Each spheromak has two extreme values for its orientation dependent energy, aligned and opposed. Then the spheromak can transition from its lower energy state to its higher energy state by absorption of a photon or can transition from its higher energy state to its lower energy state by emission of a photon. The frequency Fp of the emitted or absorbed photon is related to the energy difference dE between the two states "a" and "b" by the formula:
(Eb - Ea) = dE
= h Fp
h = Planck constant.

Thus if an atomic charged particle is located within an externally applied magnetic field the net particle charge Q remains unchanged and the charge circulation velocity C within the particle's spheromak remains unchanged, but the particle's potential energy is dependent on the orientation of the particle's spheromak symmetry axis with respect to the external magnetic field Bz. A change in the spheromak's symmetry axis orientation with respect to the axis of the applied external magnetic field causes a change in the particle's potential energy which change is accompanied by emission or absorption of a photon.

A change in spheromak symmetry axis orientation with respect to the applied magnetic field direction causes the spheromak poloidal loop current to interact with magnetic field Bz which causes a torque on the particle. This torque, acting through the changing angle between the two axes, causes a change in particle potential energy. At one particle orientation extreme the applied magnetic field vectorially reduces the spheromak's poloidal magnetic flux. At the other particle orientation extreme the applied magnetic field vectorially increases the spheromak's poloidal magnetic flux. The transition between these two energy extremes requires rotating the spheromak axis of symmetry through 180 degrees = Pi radians.

If RF energy of the appropriate frequency is applied the charged particles will tend to absorb photons and be excited from their lower energy state to their higher energy state. If the RF energy supply is removed the particles will tend to emit photons and decay from their higher energy state to their lower energy state. The frequency Fp of these photons is dependent via the Planck constant on the energy difference between the two particle energy states that in turn is dependent on the strength of the externally applied magnetic field.

This absorption and emission of photons at a particular frequency that is proportional to the applied magnetic field and the spheromak magnetic moment M is known as nuclear magnetic resonance (NMR). NMR is a well known non-distructive spectroscopy technique.

A NMR frequency may be slightly affected by local magnetic fields due to proximity or motion of other nearby charged particles.

The magnetic field Bz experienced by atomic particles is slightly affected by chemical bonding which causes local magnetic field changes. The magnetic field Bz within a sample is also affected by free electrons which move to partially cancel the applied magnetic field. The magnetic field seen by the atomic particles is also affected by the adjacency of other particles with magnetic moments. Note that the applied magnetic field must be highly uniform through the sample to properly resolve the narrow NMR spectral lines.

In NMR work it is helpful to have a known calibration line such as protons to correct for the effective reduction in the applied magnetic field.

A problem with the NMR technique is that protons and neutrons in nuclei tend to adopt opposing orientations from their nearest neighbours. Hence with an even number of such nucleons there is relatively little change in potential energy on application of an external magnetic field. Thus NMR works best when there is an uneven number of nucleons in a nucleus as with H-1, He-3, Li-7, etc.

Today NMR is widely used in medical imaging where it is used to creates images based on the variable spacial concentration of water containing H-1 (protons) within a tissue sample.

This web page relies on parameters developed on the web page titled: SPHEROMAK MAGNETIC MOMENT.

Let the external field be Bz. A spheromak can be viewed as a constant current loop that interacts with the applied magnetic field. The magnetic moment M of the spheromak can be measured using the formula:
M = (h / 2) (Fp / Bz)
Fp = the frequency of photons absorbed or emitted
Bz = the externally applied magnetic field
h = Planck Constant.

The experimentally measured value for protons in water is:
(Fp / Bz) = (42.5781 X 10^6 Hz / T).

The theoretical analysis at SPHEROMAK MAGNETIC MOMENT shows that:
(Fp / Bz)
= [(Q C Ro) / (So^2 h)] [Im] [2 Nr / Pi] [So / {[Nr^2 (So^2 + 1)^2] + [(So^2 - 1)]^2}^0.5]

This formula allows determination of Ro for each responding charged particle. With high resolution the effects of chemical bonds between different atoms can also be seen.

Im = 19.9349
Mu = 4 Pi X 10^-7 T^2 m^3 / J
Qa = 1.602 X 10^-19 coul
C = 2.99792458 X 10^8 m / s
h = 6.62606597 X 10^-34 m^2 kg / s
Me = 9.109 10-31 kg
Pi = 3.14159
Np = 222
Nt = 305
Nr = 0.7278688525
Nr^2 = 0.5297930664
So = 2.025950275
So^2 = 4.104474517

coul (m / s) T = kg m / s^2
coul / kg = (1 / T-s)
T = kg / coul s
J = kg m^2 / s^2
J / T = kg m^2 coul s/ s^2 kg = m^2 coul / s

J / T^2 m^2 coul = (m^2 coul) / (s T m^2 coul) = 1 / s T

There is an analogous technique known as electron spin resonance (ESR). However, it is not very useful because in many substances the electrons tend to pair so as to cancel out their spin related magnetic fields.

This web page last updated July 14, 2018.

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