13.07.2015 Views

Mathematical Methods for Physics and Engineering - Matematica.NET

Mathematical Methods for Physics and Engineering - Matematica.NET

Mathematical Methods for Physics and Engineering - Matematica.NET

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

25.7 WKB METHODS<strong>for</strong> some constant A. This <strong>for</strong>m is only valid <strong>for</strong> negative z close to z = 0 <strong>and</strong> is notappropriate within the well as a whole, where the approximation (25.55) leading to Stokes’equation is not valid. However, it does allow us to determine the correct combination ofthe WKB solutions found earlier <strong>for</strong> the proper continuation inside the well of the solutionfound <strong>for</strong> z>0. This isψ 1 (x) = √ A (∫ asin k(u) du + π ).k(x) x 4A similar argument gives the continuation inside the well of the evanescent solutionrequired in the region x 0 in the range −a

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!