Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1985-1989  (3)
Source
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Rotational tunneling of the NH+4 ion in phase II of (NH4)2 PtBr6 by inelastic neutron scattering spectroscopy (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 1199-1201 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The observed inelastic neutron scattering (INS) spectrum of rotational tunneling of the NH+4 ion in (NH4)2PtBr6 is shown to be in good agreement with the calculated INS spectrum for this ion at a site of C3 rotational symmetry. Previous studies of (NH4)2PtBr6 have suggested different site symmetries for the ammonium ion in this crystal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455233
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The rotational hindrance potential of NH3 groups in Ni(NH3)6I2 (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 6809-6815 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The INS librational spectra of Ni(NH3)6I2 and Ni(ND3)6I2 are shown to be consistent with the motions of a single-type ammine rotor in a hindrance potential of the form cos(3φ). A barrier height of 18.6 meV is derived. The three peaks which arise in the spectrum of the tunnel-split ground state are attributed to ammine:ammine interactions and do not simply reflect the local symmetry at the nickel atom. A qualitative study of the differing behavior of these three tunneling peaks on changes in temperature, partial deuteration, and pressure shows that the NH3:NH3 coupling is sensitive to the rotational states of neighboring groups and changes to the order parameter as the II–I phase transition is approached. Direct interaction of the NH3 groups with the anion seems to be very slight.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453374
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    The hindrance potential and coupling of the NH3 quantum rotors in Co(NH3)6(PF6)2 (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 5989-5993 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The first example of transitions between almost free rotational levels of NH3 groups in the solid state is shown by the inelastic neutron scattering spectrum of Co(NH3)6(PF6)2, and can be interpreted in terms of a very weak sixfold potential. Additional satellite peaks are visible around the 0→1 rotational feature at high spectral resolution and it is shown that the temperature dependence of these satellites demonstrates that they originate from a coupling between NH3 rotors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452485
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...