Application of the method of continued fractions to multichannel studies on electron-impact excitation of the B-1 Sigma(+)(u), (CIIu)-I-1 and E(F)(1)Sigma(+)(g) states in H-2

In the present work, the method of continued fractions at a five-channel close-coupling level of approximation is applied to study the low-energy electron-impact excitation in linear molecules. Particularly, cross sections for the X(1)Sigma (+)(g)-->B(1)Sigma (+)(u), X(1)Sigma (+)(g)-->E(F)(1)Sigma (+)(g), and X(1)Sigma (+)(g)-->(CIIu)-I-1 transitions in H-2 in the (15-40) eV energy range are reported. No orthogonality constraint between the bound and continuum orbitals is imposed in the present study and the one-electron exchange terms are explicitly considered. Comparison between our calculated cross sections with the available experimental data and other theoretical results is made. (C) 2001 Elsevier Science B.V. All rights reserved.57413314