The cp2k units list

CP2K Available Units of Measurement

Undefined

If the default unit of a keyword is explicitly undefined, all possible units of measurement can be used to define a proper value.
internal_cp2k

Energy

Possible units of measurement for Energies. The [energy] entry acts like a dummy flag (assumes the unit of measurement of energy is in internal units), useful for dimensional analysis.
hartree
wavenumber_e
joule
kcalmol
kjmol
Ry
eV
K_e
energy

Length

Possible units of measurement for Lengths. The [length] entry acts like a dummy flag (assumes the unit of measurement of length is in internal units), useful for dimensional analysis.
bohr
m
pm
nm
angstrom
length

Temperature

Possible units of measurement for Temperature. The [temperature] entry acts like a dummy flag (assumes the unit of measurement of temperature is in internal units), useful for dimensional analysis.
K
au_temp
temperature

Pressure

Possible units of measurement for Pressure. The [pressure] entry acts like a dummy flag (assumes the unit of measurement of pressure is in internal units), useful for dimensional analysis.
bar
atm
kbar
Pa
MPa
GPa
au_p
pressure

Angle

Possible units of measurement for Angles. The [angle] entry acts like a dummy flag (assumes the unit of measurement of angle is in internal units), useful for dimensional analysis.
rad
deg
angle

Time

Possible units of measurement for Time. The [time] entry acts like a dummy flag (assumes the unit of measurement of time is in internal units), useful for dimensional analysis.
s
fs
ps
au_t
wavenumber_t
time

Mass

Possible units of measurement for Masses. The [mass] entry acts like a dummy flag (assumes the unit of measurement of mass is in internal units), useful for dimensional analysis.
kg
amu
m_e
mass

Potential

Possible units of measurement for potentials. The [potential] entry acts like a dummy flag (assumes the unit of measurement of potential is in internal units), useful for dimensional analysis.
volt
au_pot
potential