''' Module to store chemical elements related data.
'''
C12 = 1.99264648e-26  # mass of C12 (kg/atom)
amu = 1.66053904e-27  # atomic mass unit (kg)

chem_elements = {}
chem_elements['H'] = dict(index=1, mass=1.00794)
chem_elements['C'] = dict(index=6, mass=12.0107)
chem_elements['N'] = dict(index=7, mass=14.0067)
chem_elements['O'] = dict(index=8, mass=15.9994)
chem_elements['F'] = dict(index=9, mass=18.9984032)
chem_elements['Ne'] = dict(index=10, mass=20.1797)
chem_elements['S'] = dict(index=16, mass=32.065)
chem_elements['Cl'] = dict(index=17, mass=35.453)
chem_elements['Ni'] = dict(index=28, mass=58.693)

