where m is the ratio of refractive index of the sphere n to that
of the surrounding medium nm, x is the size parameter given as
2ðnmR/ì, ãn and ên are the Riccati-Bessel functions, and the
prime represents first differentiation with respect to the argument
in parentheses. Numerical calculations of the Mie series were
performed at discrete points in the wavelength range from 300
to 800 nm.