Erika—A program for the decomposition of line spectra

✍ Scribed by M. Ryšavý; M. Fišer

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 766 KB
• Volume: 29
• Category: Article
• ISSN: 0010-4655
• DOI: 10.1016/0010-4655(83)90072-3

✦ Synopsis

Title of program: ERIKA Nature of the physical problem After having measured a real line spectrum, it is necessary to Catalogue number: ACEH decompose it into particular lines. The present program performs this task and supplies the positions and heights of all Program obtainable from: CPC Program Library, Queen's Uni-peaks. versity of Belfast, N. Ireland (see application form in this issue) Method of solution Computer: ES 1040; Installation: Nuclear Research Institute, Every line is described by an analytic function depending on Reñear Prague, Czechoslovakia

several parameters (height, position and shape parameters). The optimum values of these parameters are determined by the Operating system: OS/2 I .8F-MVT minimization of the function x 2 using the simplex minimization method. Moreover, a background which may also be a function Programming language used: FORTRAN IV of several parameters is fitted, as well.

High speed store required: 80 kbytes

Restriction on the complexity of the problem

In the present version, the program is suitable for the decom-No. of bits in a byte: 8 position of the internal conversion spectra. To apply it to spectra of different types, the line shape should probably be Peripherals used: card reader, line printer modified (see the long write-up for details). A maximum of 20 parameters can be used. The spectrum to be decomposed must Number of cards in combined program and test deck: 1626 be given in no more than 150 points.

Cardpunching code: EBCDIC Typical runnig time

The running time depends on the number of parameters fitted.