3.1.15 IBRAV=8 simple orthorhomibic lattice(単純斜方格子)

CELLDM(1) $=a$, CELLDM(2) $=b/a$, CELLDM(3) $=c/a$, $\Omega=abc$
$({\bf a}_{1},{\bf a}_{2},{\bf a}_{3})= ({\bf x},{\bf y},{\bf z}) \left( \begin{array}{ccc} a & 0 & 0 \\ 0 & b & 0 \\ 0 & 0 & c \end{array} \right)$
$({\bf b}_{1},{\bf b}_{2},{\bf b}_{3})= \frac{2 \pi}{a} ({\bf x},{\bf y},{\bf ... ...{array}{ccc} 1 & 0 & 0 \\ 0 & a/b & 0 \\ 0 & 0 & a/c \end{array} \right)$