High‐resolution inelastic neutron scattering was used to investigate the rotational tunneling of methane molecules in a ■×■R45° commensurate, square‐lattice–solid monolayer adsorbed on MgO (100) surfaces. Good matches to the observed transition energies were obtained using potential functions with C2v symmetry, suggesting that the preferred orientation of the molecule is the dipod‐down configuration with two opposite edges of the H‐atom tetrahedron parallel to the surface plane.
REFERENCES
1.
W. Press, Single-Particle Rotations in Molecular Crystals (Springer-Verlag, Berlin, 1981).
2.
3.
4.
Y. Kataoka, W. Press, U. Buchenau, and H. Spitzer, Proceedings of the Symposium on Neutron Inelastic Scattering, IAEA (Vienna).
5.
6.
7.
8.
Y.
Ozaki
, Y.
Kataoka
, and T.
Yamamoto
, J. Chem. Phys.
73
, 3442
(1980
).9.
10.
A.
Hüller
and J.
Raich
, J. Chem. Phys.
71
, 3851
(1979
); , J. Chem. Phys.
11.
12.
13.
14.
15.
This content is only available via PDF.
© 1991 American Institute of Physics.
1991
American Institute of Physics
You do not currently have access to this content.
