wulfric.Crystal.b1

property

property Crystal.b1

First reciprocal lattice vector.

\[\boldsymbol{b_1} = \frac{2\pi}{V}\boldsymbol{a_2}\times\boldsymbol{a_3}\]

where \(V = \boldsymbol{a_1}\cdot(\boldsymbol{a_2}\times\boldsymbol{a_3})\)

Returns:

b1(3,) numpy.ndarray

First reciprocal lattice vector \(\boldsymbol{b_1}\).