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Date: 26-9-2019
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The Hankel functions of the first kind are defined as
(1) |
where is a Bessel function of the first kind and is a Bessel function of the second kind. Hankel functions of the first kind is implemented in the Wolfram Language as HankelH1[n, z].
Hankel functions of the first kind can be represented as a contour integral over the upper half-plane using
(2) |
The derivative of is given by
(3) |
The plots above show the structure of in the complex plane.
REFERENCES:
Arfken, G. "Hankel Functions." §11.4 in Mathematical Methods for Physicists, 3rd ed. Orlando, FL: Academic Press, pp. 604-610, 1985.
Morse, P. M. and Feshbach, H. Methods of Theoretical Physics, Part I. New York: McGraw-Hill, pp. 623-624, 1953.
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