J . Q u a n t. S p e c t r o s c . R a d i a t . T r a n s f e r V ol. 61, N o . 3, pp. 3 1 9 -3 2 7 , 1999 © 1998 E lsevier Science Ltd. There is great interest in spectroscopy data from xen on due to ap p lication s in collision physics, high-tem perature plasm as and laser physics. The experim ental set-up is sim ilar to th at described in the w ork o f G allard o et a l6 SW R plates were used to record the new spectra in the vacuum ultraviolet region, w here k n ow n fines o f C, N , O, X e II and X e III were used as internal standards. In the U V -v isib le region new spectra were recorded using a w ater-cooled P yrex tube 1.3 m lo n g and 3 m m internal bore. T h e indium -coated tungsten *

The mathematical inequality which in quantum mechanics gives rise to the uncertainty principle between two non commuting operators is used to develop a spatial step-size selection algorithm for the Split-Step Fourier Method (SSFM) for solving Generalized Non-Linear Schrödinger Equations (G-NLSEs). Numerical experiments are performed to analyze the efficiency of the method in modeling optical-fiber communications systems, showing its advantages relative to other algorithms.

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