The modified spherical Bessel differential equation is given by the spherical Bessel differential equation with a negative separation constant,
The solutions are called modified spherical Bessel functions of the first and second kinds.
The modified spherical Bessel differential equation is given by the spherical Bessel differential equation with a negative separation constant,
The solutions are called modified spherical Bessel functions of the first and second kinds.
Weisstein, Eric W. "Modified Spherical Bessel Differential Equation." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ModifiedSphericalBesselDifferentialEquation.html