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An Endeavour trial version is available free-of-charge and can be downloaded. More...


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Endeavour: Frequently Asked Questions

The "Frequently Asked Questions" (FAQ) page for Endeavour provides an overview over the most common questions along with the corresponding answers.

If you encounter a problem with your installation, please check if your Endeavour version is up-to-date. You find an update opportunity on our Endeavour Update Page.

Since many functions of Endeavour, mainly the crystal structure visualization, are related with functions in Diamond, please also read the Frequently Asked Questions page for Diamond.

You can also send your comment or request to

Q(uestion): I want to determine the unit cell parameters from the powder diffraction pattern (indexing), but Endeavour can't do it.
A(nswer): One option is to use Match! along with the FullProf package (which also contains the indexing programs Treor and Dicvol). This is demonstrated in the corresponding tutorial video.
An alternative would be to use the Crysfire powder indexing system that can be downloaded free-of-charge (for academic usage) from
Crysfire still is an excellent and elaborate package for indexing, being able to use a large variety of different indexing programs/methods (ITO, TREOR, DICVOL, KOHL etc.). Having a variety of different indexing approaches available is generally adventageous, since not all methods are equally successful in solving different indexing problems.

Q: How can I define the total count of atoms per unit cell (cf. "Preparation of Structure Solution" wizard) - my XRD software can't find it.
A: The way to find a reasonable number of atoms per unit cell strongly depends on the compound under investigation. In any case, the composition (formula sum) of the compound under investigation must be known first. Typically, one can then use the density (either of the compound under investigation or the one of similar compounds) and/or the space filling as a guide:
First, you should try to find a reasonable density and/or space filling percentage, e.g. by measurement and/or determining values from similar compounds/structures. Afterwards, you should compare these value(s) to the ones that are calculated and displayed for the current input data in step 2 and 3 of Endeavour's so-called "structure solution wizard". Provided that the composition (formula sum) has already been entered, you can adjust the "Z" parameter (Z = number of formula units per unit cell) in order to find the best agreement between estimated and calculated density/space filling.
In some cases, it may also be helpful to take the multiplicity of the general position of the space group into account, in order to find a reasonable value for Z.