Inelastic Scattering of Slow Neutrons from Methane

Scattering of Slow Neutrons from Ammonia and Hydrogen Sulfide

“…Values of S(K, e) for specific energy transfers are obtaine~ from the ~hannel by channel calculations by a four-pomt parabohc fit and subsequent interpolation. 8 For ~n eXI;>erimental run at a given energy, this inter-polatIOn Yields one value of S(K, e) for each angle for E=O and 1 e I>Eo/kBT, and two values of S(K, e) for each angle for 0< 1 e 1 :::; Eo/kBT. When the interpolated data from three separate experimental runs at different incident neutron energies are plotted vs K there are as many as 90 S(K, e) points for each value of 1 e I.…”

The aqueous-polyelectrolyte dye solution as an active laser medium

“…By adopting the notation of equation (37) for the Debye-Waller factors in this special case, and by noting that equation (42) reduces to j 0 (Q R eq ν ) when the initial and final states coincide, equation (50) becomes…”

“…Existing data on CH 4 are, however, quite old [42][43][44][45] and usually suffer from the mentioned problem concerning energy resolution broadening [42,43] and/or missing data normalization [44,45]. Therefore, examples are limited here either to the comparison with normalized methane data [42,43], whose energy resolution effects can be taken into account with some confidence, or with (unnormalized) low-E 0 measurements [45], i.e. affected by negligible resolution broadening.…”

“…affected by negligible resolution broadening. Figure 6 reports the experimental neutron data for gaseous [42] and liquid [43] methane, at fixed scattering angles. Incident neutron energy and sample temperature are specified on each frame.…”

“…Calculations were convoluted with a ∼1.5 meV Gaussian resolution function R in order to make the comparison with experiment possible (see the text). (d), (e): gaseous methane neutron data at two angles of[42] (dots), compared with the calculations performed with the ideal gas law for translations. Results with (full curve) and without (chain curve) correction for a ∼1.5 meV resolution are shown.…”