+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ PDF Full Text
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Translate
+ Recently Requested

Proton momentum distribution and anomalous scattering intensities in a pseudo-spherical ammonium ion: a neutron Compton scattering study of (NH(4))(2)PdCl(6) and (NH(4))(2)TeCl(6)

Proton momentum distribution and anomalous scattering intensities in a pseudo-spherical ammonium ion: a neutron Compton scattering study of (NH(4))(2)PdCl(6) and (NH(4))(2)TeCl(6)

Journal of Physics. Condensed Matter 21(7): 075502

Neutron Compton scattering (NCS) measurements on ammonium hexachloropalladate and hexachlorotellurate were performed at room temperature. Proton scattering intensities and momentum distributions, as measured in the NCS experiment, have been compared with results expected from the impulse approximation (IA) for both systems. The measurement shows that scattering intensity from protons is anomalous even though their momentum distribution has a second moment that agrees very well with the ab initio calculation for an isolated pseudo-spherical NH(4)(+) ion in the ground vibrational state. Detailed data analysis shows that there is no extra (beyond the IA expected value) broadening or peak shift of proton momentum distribution due to ultra-fast kinetics of the Compton scattering process leading to anomalous scattering intensities. This is most probably due to highly symmetric local potential in the NH(4)(+). Presented results have interesting implications for further theoretical work in the field.

(PDF emailed within 0-6 h: $19.90)

Accession: 055260198

Download citation: RISBibTeXText

PMID: 21817329

DOI: 10.1088/0953-8984/21/7/075502

Related references

Anomalous neutron Compton scattering cross sections in ammonium hexachlorometallates. Journal of Chemical Physics 126(12): 124501, 2007

Effects of entanglement on the scattering intensity of neutron compton scattering by a proton pair in solids. Physical Review Letters 94(16): 165506, 2005

Spherical momentum distribution of the protons in hexagonal ice from modeling of inelastic neutron scattering data. Journal of Chemical Physics 136(2): 024504, 2012

Momentum distributions in fluids determined by neutron compton scattering. Il Nuovo Cimento D 16(7): 737-745, 1994

Compton-scattering cross section on the proton at high momentum transfer. Physical Review Letters 98(15): 152001, 2007

Development of multi-channel apparatus for electron-atom Compton scattering to study the momentum distribution of atoms in a molecule. Review of Scientific Instruments 88(6): 063103, 2017

Momentum distribution in vanadium: Compton scattering and positron annihilation. Physical Review. B, Condensed Matter 46(12): 7857-7863, 1992

Measurement of the proton wave function in molecular hydrogen by neutron Compton scattering. Physical Review Letters 71(10): 1553-1556, 1993

Momentum distribution in benzene: A comparison of compton scattering and positron annihilation. Applied Physics A: Materials Science & Processing 4(3): 249-256, 1974

Compton scattering studies of the electron momentum distribution in indium phosphide. Radiation Physics and Chemistry 54(4): 335-344, 1999

Measurement of proton momentum distributions by eV neutron scattering. Journal of Molecular Structure 615(1-3): 275-282, 2002

Proton vibrational dynamics in lithium imide investigated through incoherent inelastic and Compton neutron scattering. Journal of Chemical Physics 137(20): 204309, 2012

Electron momentum distribution in vanadium: Compton scattering measurements and band-structure calculation. Physical Review. B, Condensed Matter 33(2): 755-759, 1986

Compton scattering and the study of electron momentum density distributions. Radiation Physics and Chemistry 50(1): 63-76, 1997

Compton Scattering Study of the Electron Momentum Density for Bismuth Single Crystal. Physica Status Solidi 217(2): 903-910, 2000