Ĥ = T̂ + V̂
with
    V̂ = V = V(𝐫,t) (potential energy operator)
and
    T̂ = _͟𝐩̂͟⋅͟𝐩̂͟ = _͟p̂͟²͟ = -_͟ħ͟²͟ ∇² 
         2m     2m     2m
since
    p̂ = -ιħ∇.


Ĥ = T̂ + V̂ = -_͟ħ͟²͟ ∇² + V(𝐫,t). 
              2m