## Hankel Function of the Second Kind

where is a Bessel Function of the First Kind and is a Bessel Function of the Second Kind. Hankel functions of the second kind can be represented as a Contour Integral using

Arfken, G. Hankel Functions.'' §11.4 in Mathematical Methods for Physicists, 3rd ed. Orlando, FL: Academic Press, pp. 604-610, 1985.