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Manuscript Title: A Pascal program for the least-squares evaluation of standard RBS spectra.
Authors: V. Hnatowicz, V. Havranek, J. Kvitek
Program title: RBSFIT
Catalogue identifier: ACJR_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 72(1992)295
Programming language: Pascal.
Computer: PC AT, PC XT.
Operating system: MS-DOS.
RAM: 65K words
Word size: 16
Keywords: General purpose, Fit, Nuclear physics, Particle detection, Rutherford Backscattering method, Multichannel energy Spectra, Region of interest, Least-squares method, Data treatment.
Classification: 4.9, 17.5.

Nature of problem:
The program serves for the determination of basic parameters, e.g. positions, amplitudes and areas of specific components appearing in the energy spectra of elastically scattered particles.

Solution method:
The pertinent parameters are determined using standard non-linear least- squares fitting of suitable analytical representation into the measured multichannel energy spectrum. The spectrum is treated as a combination of variable number of three different basic figures (strip, bulge and Gaussian) which are described by ad-hoc chosen analytical expressions. The initial parameter values are inserted by an operator (with assistance of graphical support on the screen) and the final results of the fit are displayed on the screen and stored as a table.

Restrictions:
The total number of adjustable parameters should not exceed 30.

Running time:
The typical RBS spectrum comprising 1000 channels and four basic components (altogether 13 adjustable parameters) is evaluated in 300 s on a PC AT (CPU 10 MHz).