...NN00 ¹

The first definition of these operators was actually by Buckmaster [Buckmaster(1962)], however Wybourne was the first to popularise the $B_q^k$ parameters, c.f. Ref.[Wybourne(1965)], ch. 6

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

... equation²

See for example Abramowitz and Stegun, page 1009.

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

... normalisation³

Although Steven's normalisation is commonly used in the neutron literature, the symbol most often used is $B_q^k$ , rather than $A_{kq}\langle r^k \rangle$ . In addition we also follow the common usage amongst the neutron scattering community and omit the operator equivalent factors in the CF parameter.

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

... frequencies⁴

SAFiCF is designed to fit time-of-flight neutron spectra

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.