Bessel FunctionsOne of the varieties of special functions which are encountered in the solution of physical problems is the class of functions called Bessel functions. They are solutions to a very important differential equation, the Bessel equation: The solutions to this equation are in the form of infinite series which are called Bessel funtions of the first kind. The expression for the sum is Values for the Bessel functions can be found in most collections of mathematical tables. Bessel functions are encountered in physical situations where there is cylindrical symmetry. This occurs in problems involving electric fields, vibrations, heat conduction, optical diffraction and others. For the specific application to a spherical potential well in quantum mechanics, another form called spherical bessel functions appears. 
Index Reference Kreyszig Sec 4.5  

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Spherical Bessel FunctionsA specific class of special functions called spherical Bessel functions arises in problems of spherical symmetry like the spherical potential well in quantum mechanics. The first three forms are From the first form, the higher order forms can be generated from the relationship It is sometimes useful to have the limiting cases for these functions for very large or very small distances: 
Index Reference Krane Ch 2  

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