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ROTATIONAL TRANSITIONS IN THE $\nu_9$ AND $\nu_7$ VIBRATIONAL STATES OF $cis$-HCOOH

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/30274

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Title: ROTATIONAL TRANSITIONS IN THE $\nu_9$ AND $\nu_7$ VIBRATIONAL STATES OF $cis$-HCOOH
Creators: Baskakov, Oleg I.; Winnewisser, B. P.; Medvedev, Ivan R.; De Lucia, Frank C.
Issue Date: 2005
Abstract: The energy difference between $cis$-HCOOH and $trans$-HCOOH in the gas phase, ca. 1365 cm$^{-1}$, was determined from a handful of MW transitions detected in formic acid at room temperature and reported in 1976} {bf 31}, 1113--1121 (1976).}. A full analysis of the ground state spectrum of the $cis$ rotamer based on FIR date was not provided until 2002} {\bf 216}, 259--265 (2002).}. For over 20 years unsuccessful efforts have been made to find vibrational bands of the $cis$ rotamer in the gas phase IR spectrum. In the meantime, ab initio calculations and matrix spectra have yielded substantial information about the vibrational modes of this molecule} {\bf 219}, 70--80 (2003).}. We report here the first quantitative gas phase information about the excited vibrational states $\nu_9$ and $\nu_7$ of $cis$-HCOOH, obtained from FASSST measurements between 115 and 375 GHz, in a 6 m cell heated to 443 K. To date 427 transitions have been assigned for $\nu_9$, and 336 for $\nu_7$. The rotational and centrifugal distortion constants for these two states will be presented, together with a new set of ground state constants.
URI: http://hdl.handle.net/1811/30274
Other Identifiers: 2005-FC-06
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