title: The Ground and First Excited Torsional States of Acetic Acid.
abstract: A global fit of microwave and millimeter-wave rotational transitions in the ground and first excited torsional states (v(t) = 0 and 1) of acetic acid (CH(3)COOH) is reported, which combines older measurements from the literature with new measurements from Kharkov, Lille, and NIST. The fit uses a model developed initially for acetaldehyde and methanol-type internal rotor molecules. It requires 34 parameters to achieve a unitless weighted standard deviation of 0.84 for a total of 2518 data and includes A- and E-species transitions with J </= 30 and K(a) </= 15. While these results represent a significant improvement over past fitting attempts, it should be cautioned that the present data set is dominated by v(t) = 0 transitions, and no direct infrared measure of the v(t) = 1 <-- 0 torsional interval is available. Copyright 2001 Academic Press.
authors.affiliation: Institute of Radio Astronomy of NASU, Krasnoznamennaya 4, Kharkov, 310002, Ukraine
authors.forename: V. V.
authors.initials: VV
authors.lastname: Ilyushin
authors.forename: E. A.
authors.initials: EA
authors.lastname: Alekseev
authors.forename: S. F.
authors.initials: SF
authors.lastname: Dyubko
authors.forename: S. V.
authors.initials: SV
authors.lastname: Podnos
authors.forename: I.
authors.lastname: Kleiner
authors.forename: L.
authors.initials: L
authors.lastname: Margulès
authors.forename: G.
authors.initials: G
authors.lastname: Wlodarczak
authors.forename: J.
authors.initials: J
authors.lastname: Demaison
authors.forename: J.
authors.initials: J
authors.lastname: Cosléou
authors.forename: B.
authors.initials: B
authors.lastname: Maté
authors.forename: E. N.
authors.initials: EN
authors.lastname: Karyakin
authors.forename: G. Yu.
authors.initials: GY
authors.lastname: Golubiatnikov
authors.forename: G. T.
authors.initials: GT
authors.lastname: Fraser
authors.forename: R. D.
authors.initials: RD
authors.lastname: Suenram
authors.forename: J. T.
authors.initials: JT
authors.lastname: Hougen