Electronic Resource
College Park, Md.
:
American Institute of Physics (AIP)
The Journal of Chemical Physics
89 (1988), S. 6053-6057
ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
The structures of NaI, KI, RbI, and CsI in the vapor phase were determined via standard electron diffraction counting techniques with nozzle temperatures ranging from 770–866 K. The data analysis yielded the structure parameters and the ratio of the monomeric to dimeric compounds. The mean amplitudes of vibration for the monomeric molecules were held at values based on microwave frequencies and the harmonic potential approximations. The corrected monomer distances re agree well with microwave-spectroscopy results. Rhombic geometries with bonded dimer distances ranging from 3.00 to 3.57 A(ring) and I–M–I angles that ranged from 95° to 102° were observed. The dimer mole fraction in the vapor varied from 3% to 18%. There was no significant amount of any trimeric species observed in the vapor. The bonded distance of KI was found to be equal to the interionic separation of the crystal. The observed dimer mole fractions were compared with various theoretical predictions.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.455419
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