added guthrie Mo data

[paulbrrn]

Added Mo permeation data and citation from Guthrie1974

[RemDelaporteMathurin]

Hi @paulbrrn thanks for your first contribution!

The main issue with this is that you haven't really added anything to the database.

If you try and run:

import h_transport_materials as htm

htm.permeabilities.filter(material=htm.MOLYBDENUM, author="guthrie")

It won't find anything.

Thats because you need to create a new property object and add it to the database.
I've added some details in the comments.

[RemDelaporteMathurin]

This file shouldn't be included in version control (see the second line in the file) please remove

[RemDelaporteMathurin]

I think you accidentally added this file to version control, please remove

[RemDelaporteMathurin]

I think you accidentally added this file to version control, please remove

[RemDelaporteMathurin]

I understand this is the pre-exponential factor for deuterium's permeability in Mo (Figure 7 in the paper).
If you want to add this property to HTM then you need to:

1. Create an ArrheniusProperty object (here use Permeability) in h_transport_materials/property_database/molybdenum.py
2. Add it to the database as explained in the contributing guide

Here it would look something like:

guthrie_permeability = Permeability(
    pre_exp=3.8e-3 * u.ccSTP * u.cm**-1 * u.s**-1 * u.atm**-0.5,
    act_energy=17.4 * u.kcal * u.g**-1,  # careful here with the conversion from kcal/g-atom to kcal/mol
    range=(u.Quantity(270, u.degC), u.Quantity(640, u.degC)),
    note="Figure 7",
    source="Guthrie1974",
)