# gauss2mhz.m

Converts hyperfine couplings from Gauss to MHz (linear frequency). The Gauss specification may be defined as "the magnetic field at which the electron frequency is equal to the frequency provided".

## Syntax

hfc_mhz=gauss2mhz(hfc_gauss,g)

## Arguments

hfc_gauss  - an array of values in Gauss

g          - electron g-factor; if this parameter
is skipped, free electron g-factor is
used for conversion

## Outputs

hfc_mhz    - an array of values in MHz

## Examples

See examples/esr_liquids and examples/esr_solids directories.

## Notes

The principal advantage of Gauss and mT units for hyperfine coupling is that they make the hyperfine tensor independent of the electron g-tensor. This is very useful in ab initio calculations of hyperfine couplings because g-tensor is a much harder quantity to compute.