# EVIDENCE OF PROTON TUNNELING IN THE ROTATIONAL SPECTRUM OF THE PROPIOLIC ACID-FORMIC ACID HYDROGEN BONDED COMPLEX

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 Title: EVIDENCE OF PROTON TUNNELING IN THE ROTATIONAL SPECTRUM OF THE PROPIOLIC ACID-FORMIC ACID HYDROGEN BONDED COMPLEX Creators: Douglass, Kevin O.; Crum, Pam L.; Suenram, R. D.; Pate, Brooks H. Issue Date: 2004 Publisher: Ohio State University Abstract: We have measured the rotational spectrum of the hydrogen bonded system of propiolic acid and formic acid. The spectral fitting was aided by density functional calculations and FTMW-MW double resonance spectroscopy. The structure is predicted to be an 8 member ring system where the hydrogen bonding takes place between the acid functionalities of the monomers. The spectra were obtained using a neat 4:1 mixture of propiolic - formic acid while heating the nozzle to $50^{\circ}$C. The spectrum was measured from 10 to 22 GHz. Each a-type rotational transition consists of a doublet with an intensity ratio that alternates with even and odd $K_{a}$ and are suggestive of 3:1 hydrogen spin statistics. These doublets result from proton tunneling splitting. The results of the proton tunneling splitting will be presented. Description: Author Institution: Department of Chemistry, University of Virginia URI: http://hdl.handle.net/1811/21517 Other Identifiers: 2004-WH-13