Abstract
The two ~ and four IT states of the weakly bound complex Ar-NH3 correlating to j = 2, k== ± 1
ammonia have been observed by tunable far infrared difference frequency-microwave sideband
spectroscopy. The r~sults have been combined 'with published data to determine a new angular
potential energy surface for the system. :rhe barrier to threefold internal rotation of the NH3
about its C3 axis in the complex is estimated to be 25.606(24) cm-1 near the minimum energy
(T-shaped) configuration. The potential also exhibits maxima at both symmetric top configurations,
with energies approximately 53 and 31cm - 1, respectively above that of the global
minimum. The location and splitting between the symmetric and antisymmetric l: states are
indicative of a strong interaction with another pair of unobserved states, most likely the first
excited intermolecular stretch built on j = 1, k= ± 1 Ar-NH3'
| Original language | American English |
|---|---|
| Journal | Journal of Chemical Physics |
| State | Published - Feb 15 1994 |
Disciplines
- Atomic, Molecular and Optical Physics