Multiplying the average number density by 4-pi-r-squared gives this type of "distribution function," whose Fourier transform appears in the definition of the structure factor.
It's not "pair," but this is the first word in the name of a function that can be integrated up to its first minimum to give the coordination number of a liquid. This portion of the hydrogen atom wavefunction is divided by its argument to give a dummy variable u, for which solutions are written in terms of Laguerre ("la-GAIR") polynomials. Multiplying the average number density by 4-pi-r-squared gives this type of "distribution function," whose Fourier transform appears in the definition of the structure factor. Orbitals have "N minus L minus one" nodes described by this adjective, such as one for the 2s ("two-ess") orbital and two for the 3s orbital. In astronomy, movement in this direction may cause a Doppler redshift or blueshift. For 10 points, give this adjective that describes the non-angular coordinate in a polar coordinate system, whose direction is symbolized r-hat.
It's not "pair," but this is the first word in the name of a function that can be integrated up to its first minimum to give the coordination number of a liquid.
radial [accept radius; accept radial distribution function or radial kinetic energy or radial velocity or radial direction] &lt;Physics&gt;