Effective method of representing first derivatives of combined contours of lines in problems of modeling and interpretation of complicated spectra

It is shown that the integral convolution of the first derivatives of Lorentz and Gauss functions can be replaced, with a high degree of accuracy, by their linear combination. Here, a unique transition from approximation to convolution parameters and back is possible. Use of such a linear combination in calculations of line contours allows a gain in the calculation speed by 1–2 orders of magnitude. Research Institute of Radiative Medicine, 23, Masherov Ave., Minsk, 220600, Belarus. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 1, pp. 42–44, January–February, 1997.