MICROWAVE SPECTRUM AND STUCTURE OF $HNO_{3}-H_{2}O$
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Date
1996
Authors
Canagaratna, M.
Phillips, J. A.
Ott, M. E.
Leopold, K. R.
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The microwave spectrum of $HNO_{3}-H_{2}O$ and six of its isotopic derivatives have been investigated by pulsed-nozzle Fourier transform microwave spectroscopy. The complex has a cyclic, doubly hydrogen bonden structure with a coplanar arrangement of the heavy atoms. One of the water protons lies above the plane. A near-linear hydrogen bond, 1.76 \AA in length, is formed between the proton of the $HNO_{3}$ and the oxygen of the $H_{2}O$. A longer (2.76 \AA) hydrogen bond between one of the water protons and an oxygen of the $HNO_{3}$ completes the ring. The dimer was produced by continuously evaporating liquid water into a pulsed expansion of $HNO_{3}$ in Ar, and evidence is presented for extensive H/D isotopic scrambling during experiments using $H_{2}O + DNO_{3}$ or $D_{2}O + HNO_{3}$. The results are compared with recent ab initio calculations.
Description
Author Institution: Department of Chemistry, University of Minnesota