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TERAHERTZ VIBRATION-ROTATION-TUNNELING SPECTROSCOPY OF THE AMMONIA DIMER: CHARACTERIZATION OF AN OUT OF PLANE VIBRATION

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/30850

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Title: TERAHERTZ VIBRATION-ROTATION-TUNNELING SPECTROSCOPY OF THE AMMONIA DIMER: CHARACTERIZATION OF AN OUT OF PLANE VIBRATION
Creators: Lin, Wei; Han, Jia-Xiang; Takahashi, L. K.; Loeser, J. G.; Saykally, R. J.
Issue Date: 2006
Abstract: The Terahertz vibration-rotation-tunneling (VRT) spectrum of the ammonia dimer (NH$_3$)$_2$ has been measured between ca. 78.5 and 91.9 cm$^{-1}$. The dipole-allowed transitions are separated into three groups that correspond to the threefold internal rotation of the NH$_3$ subunits. Transitions have been assigned for VRT states of the $A-A$ ($ortho-ortho$) combinations of NH$_3$ monomer states. The spectrum is further complicated by strong Coriolis interactions. $K=0 \leftarrow 0, K=1 \leftarrow 0, K=0 \leftarrow 1$, and $K=1 \leftarrow 1$ progressions have been assigned. The band origins, rotational constants, asymmetry doubling, centrifugal distortion, and Coriolis coupling constant have been determined from the fit to an effective Hamiltonian. These VRT transitions are tentatively assigned to an out of plane vibration with a $K=0$ state at 89.141305(47) cm$^{-1}$, and a $K=1$ state at 86.77785(9) cm$^{-1}$.
URI: http://hdl.handle.net/1811/30850
Other Identifiers: 2006-FE-01
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