# THE ROTATIONAL SPECTRUM OF CIS- AND TRANS-FORMIC ACID, REVISITED

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 Title: THE ROTATIONAL SPECTRUM OF CIS- AND TRANS-FORMIC ACID, REVISITED Creators: Winnewisser, B. P.; Winnewisser, M.; Stein, Monika; Birk, M.; Wagner, G.; Winnewisser, G.; Yamada, Koichi M. T.; Belov, S. P.; Baskakov, Oleg I. Issue Date: 2001 Publisher: Ohio State University Abstract: The initial experimental confirmation of the existence of the cis rotamer of formic acid, HCOOH, was based on a small number of pure rotational transitions in the microwave region [W. H. Hocking, Z Naturforsch. 31a, 1113-1121 (1976)]. Since then, there have been no further report of the observation of spectral features attributable to this species. In order to extend the study of the spectrum of cis-HCOOH we have recorded the far infrared spectrum of HCOOH from 30 to $100 cm^{-1}$ (Oberpfaffenhofen). This spectrum has now been supplemented by millimeter wave measurements (Kharkov) and submillimeter wave measurements (K\""oln), so that a very extensive set of data is now available for both rotamers. The analysis of the spectrum (Giessen, Kharkov)has now yielded a more complete set of ground state constants for each rotamer than was previously available, providing in particular a sound basis for the search for infrared transitions of cis-HCOOH. Description: $^{a}$Present address: Department of Physics, The Ohio State University, Columbus, Ohio 43210, $^{b}$Present address: Department of Physics, The Ohio State University, Columbus, Ohio 43210 Author Institution: Physikalisch-Chemisches Institut der Justus-Liebig-Universit\""at; DLR Oberpfaffenhofen; Universit\""at zu K\""oln; I. Physikalisches Institut, Universit\""at zu K\""oln; I. Physikalisches Institut, Kharkov State University URI: http://hdl.handle.net/1811/20083 Other Identifiers: 2001-RA-02