EXACT TRAJECTORY IN SEMICLASSICAL LINE BROADENING AND LINE SHIFTING CALCULATION TEST FOR H2–He Q(1) LINE

Abstract The semiclassical model RB (Robert, D. and Bonamy, J. ( Journal de Physique (Paris), 1979, 40 , 923 for calculation of line width and line shift has been used in many applications. It contains an approximate “parabolic” trajectory. Bykov, A.D. et al, Atmospheric and Oceanic Optics (1992) 5 , 587, have recently proposed an analytical expression for an exact treatment of the classical path. This paper analyses the consequence of introducing the exact trajectory within the RB model for the H 2 –He Q (1) line chosen as a simple test. Moreover, a comparison with results of exact close-coupling calculations is also given for this molecular system.