Inelastic incoherent neutron scattering

Incoherent inelastic neutron scattering is efficient in detecting M—H vibrations because the intensity of scattering is proportional to the square of the atomic vibrational amplitude (oc 1/atomic mass) and the scattering cross section (moderately high for H). HCo(CO)4 and H3M3(CO)12 (M = Mn and Re) have been studied, for example.93... 

The above molecular dynamics results have been confirmed by incoherent inelastic neutron scattering (IINS) measurements on xenon hydrate (Tse et al., 2001 Gutt et al., 2002). In earlier measurements on methane hydrate, the dominant... 

J. S. Tse, The lattice dynamics of clathrate hydrates An incoherent inelastic neutron scattering study , Chem. Phys. Lett. 215 (1993) 383. 

J. Howard T.C. Waddington (1978). J. Chem. Soc. Faraday Trans. II, 74, 879-888. Low frequency vibrations of some p-allyl complexes of Ni and Pd studied by incoherent inelastic neutron scattering. 

W.B. Nelligan, D.J. LePoire, C.-K. Loong, T.O. Brun S.H. Chen (1987). Nucl. Inst, and Meth., A254, 563-569. Molecular spectroscopy of n-butane by incoherent inelastic neutron scattering. 

D.J. Jones J. Roziere (1993). Solid State Ionics, 61, 13-22. Complementarity of optical and incoherent inelastic neutron scattering spectroscopies in the study of proton conducting materials. 

A. Maconnachie, A.J. Dianoux, H. Shirakawa, M. Tasumi (1986). Synth. Met., 14, 323-327. Incoherent inelastic neutron-scattering from polyacetylenes in the 3500-400 cm" region. 

B. Winkler B. Hennion (1994). Phys. Chem. Minerals, 21, 539-545. Low temperature dynamics of molecular H2O in bassanite, gypsum and cordierite investigated by high resolution incoherent inelastic neutron scattering. 

W.S. Glaunsinger, M.J. McKelvy, E.M. Larson, R.B. Vondreele, J. Eckert N.L. Ross (1989). Solid State Ionics, 34, 281-286. Incoherent inelastic neutron-scattering investigation of ammoniated titanium disulfide. 

M.A. Adams J. Tomkinson (1992). Physica B, 180-181, 694-696. Incoherent inelastic neutron scattering spectrum of ammonium bromide at a pressure of 15kbar. 

A. Pawlukojc, I. Natkaniec, E. Grech, J. Baran, Z. Malarski L. Sobczyk (1998). Sp>ectrochim. Acta, 54A, 439-448. Incoherent inelastic neutron scattering, Raman and IR absorption studies on l,8-bis(dimethylamino)naphthalene and its protonated forms. 

S.F. Parker, D.A. Braden, J. Tomkinson B.S. Hudson (1998). J. Phys. Chem. B, 102, 5955-5956. Full longitudinal acoustic mode (LAM) spectrum of an n-alkane comparison of observed and computed incoherent inelastic neutron scattering spectmm of n-octadecane. 

M.A. Andrews, J. Eckert, J.A. Goldstone, L. Passell B. Swanson (1983). J. Am. Chem. Soc., 105, 2262-2269. Incoherent inelastic neutron-scattering, infrared, Raman, and X-Ray diffraction studies of pentacarbonylmethylmanganese, Mn(CO)5CH3. 

J.F. Fernandez, M. Kemali D.K. Ross (1997). J. Alloys Cmpds., 253, 248-251. Incoherent inelastic neutron scattering from the C-15 Laves phase ZrTi2H3.6. 

J. Howard T.C. Waddington (1981). Chem. Phys. Lett., 83, 211-214. Incoherent inelastic neutron-scattering studies of the torsional modes of hexachloroethane. 

A.V. Powell P.G. Dickens (1990). Appl. Phys. A, 51, 226-230. An incoherent inelastic neutron scattering study of NH4TaW06. 

It appears that without involving both mechanisms b and c, pertinent to elastic vibration, it would be difficult to calculate and interpret the double 200-cm-1 band in ice. Note that recent studies (Amo and Tominaga [26], Klug et al. [50] Nielsen et al. [27]) with use of Raman spectroscopy and incoherent inelastic neutron scattering reveal, unlike FIR spectroscopy, existence also in water of different bands in the region 50-300 cm-1. 

The incoherent inelastic neutron scattering arises from the interference of waves scattered from the same ion at different times. The differential scattering cross-section per unit solid angle and per unit interval of outgoing energy is... 

Inelastic neutron scattering is a technique that has been widely used both in the liquid and in the solid states to measure the stmcture and dynamics at small (that is, molecular) length scales. In an incoherent inelastic neutron-scattering experiment, the measured quantity is the self-dynamic structure factor Ss(Q, (o), which gives information, as in the liquid state, of the self-diSiision coefficient of the water molecules. Ss(Q, (o) is the Fourier transform of the intermediate self-scattering function Fg(Q, t), which is defined by... 

Sauvajol, J.L., D. Djarado, A.J. Dianoux, N. Theophilou, and J.E. Fischer. 1991. Polarized vibrational density of states of polyacetylene from incoherent inelastic neutron-scattering. Phys Rev B 43 14305. 

As it was discussed in O Sect. 29.2, incoherent (inelastic) neutron scattering accounts for the individual motions of atoms. Thus, in the crystalline solid state, in the absence of diffusion, most of the incoherent signals originate from molecular vibrations. Most chemical applications have something to do with the role of hydrogen to which neutrons are more sensitive than any other probe. The reason for this can be understood by looking at the incoherent inelastic cross section, which can be related to the (vibrational, one-phonon approximated) density of states distribution function Z co) as (see, e.g., Marshall and Lovesey 1971 Bacon 1977)... 

---