.. index:: TeixeiraWater
Teixeira's model for water [1].
Models the Q dependence of the QENS line width (Gamma (hwhm)), diffusion coefficients (D), residence times (tau) and jump lengths (length) to extract the associated long range diffusive motions of molecules.
This model (1961) has the form:
HWHM(Q) = \frac{\hbar}{\tau} \cdot \frac{(QL)^2}{6 + (QL)^2}
D = \frac{L^2}{6 \tau}
Units of L are inverse units of Q.
Units of HWHM are meV if units of \tau are ps. Alternatively, units of HWHM are \mu eV if units of \tau are ns.
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