radtools.Crystal.b1

property

property Crystal.b1

First reciprocal lattice vector.

\[\vec{b}_1 = \frac{2\pi}{V}\vec{a}_2\times\vec{a}_3\]

where \(V = \vec{a}_1\cdot(\vec{a}_2\times\vec{a}_3)\)

Returns:

b1(3,) numpy.ndarray

First reciprocal lattice vector \(\vec{b}_1\).