The HALTAFALL program was written in the 1960s by Nils Ingri and co-workers at the Department of
Inorganic Chemistry of the Royal Institute of Technology in Stockholm, Sweden.
It solves the non-linear system of equations by cord shooting. A special algorithm is used
to select solid phases when they become stable.
References to the HALTAFALL program:
- Ingri, N., Kakolowicz, W., Sillén, L. G. and
Warnqvist, B., High-speed computers as a supplement to graphical methods -- V. HALTAFALL,
a general program for calculating the composition of equilibrium mixtures, Talanta,
14 (1967) 1261-1286. Errata: 15 (1968) xi-xii.
- Warnqvist, B. and Ingri, N.,
The HALTAFALL program − some corrections, and comments on recent experience,
Talanta, 18 (1971) 457-458.
- Ekelund, R. and Sillén, L. G. and Wahlberg, O.,
Fortran editions of Haltafall and Letagrop, Acta Chem. Scand., 24 (1970) 3073.
The HALTAFALL algorithm is used both in SED
and PREDOM.