The Rotational Spectrum and Structure of $CH_{3}H-NH_{3}$
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Date
1986
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Ohio State University
Abstract
The rotational spectrum of $CH_{3}H-NH_{3}$ has been obtained using two spectrometers, a pulsed nozzle Fourier transform spectrometer and a molecular beam electric resonance spectrometer. A symmetric top spectrum is observed that is consistent with free internal rotation of the $NH_{3}$ subunit against the $CH_{3}H$ subunit. Rotational transitions have been measured in both the ground and first excited internal rotor state of the complex. The spectroscopic constants which have been obtained include: $B_{0} = 1996.903(2) MHz, D_{J} = 3.46(12) kHz$, and $eQ_{q}^{N} = -3.186(6) MHz$. From the quadrupole coupling constant of the N nucleus. $eQ_{q}^{N}$, the bending amplitude of the $NH_{3}$ subunit is determined to be $22.57(10)^{\circ}$. The hydrogen bond length is 2.314(5) A and the weak bond stretching force constant is 0.066(2) mdyn/A. The bond length and stretching force constant for $CH_{3}H-NH_{3}$ are similar to those determined for $HCCH-NH_{3}$ (2.33 A and 0.070 mdyn/A. respectively).
Description
Address of Nelson and Klemperer: Chemistry Department, Harvard University 12 Oxford St., Cambridge, MA 02138. Address of Fraser, Lovas and Suenram: Molecular Spectroscopy Division, National Bureau of Standards, Washington. D.C. 20234.
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