This note provides a brief description of the QBASIC programs and data files
written specially for the Crystal Field Handbook. 

QBASIC programs listed in the site are:

THREEJ.BAS, which calculates values of $3j$ symbols.
Use described in Section 3.1.1.

REDMAT.BAS, which is used to determine J-basis reduced matrix
elements of the tensor operators from LS-basis reduced
matrix elements. The use of this program is described
in Section 3.1.1. 

ENGYLVL.BAS, which is used to calculate
energy levels and eigenfunctions from crystal field parameters. 
This program is discussed at
length in Chapter 3.  A specific example of its use is
given in Section 3.1.3.

ENGYFIT.BAS, which is used to fit crystal field parameters.
This program is discussed at
length in Chapter 3.  A specific example of its use is given in
Section 3.2.

CORFACW.BAS determines combined coordination factors (Wybourne
normalization).  An example of the use of this program is given 
in Section 5.3.2. CORFACS.BAS is the same program, apart from using
Stevens normalization. 

INTRTOCF.BAS and CFTOINTR.BAS are superposition model programs
described in Chapter 5 of the book.

The Mathematica program LLWDIAG.MA, is described in Section A3.4.

Section A2.3 of the Crystal Field Handbook describes the format
of data files, denoted *.DAT and *.WDT, which are used as inputs to,
and appear in outputs of, the programs listed above.