The Ground and First Excited Torsional States of Acetic Acid.
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.
Ilyushin
V. V.
VV
Institute of Radio Astronomy of NASU, Krasnoznamennaya 4, Kharkov, 310002, Ukraine
Alekseev
E. A.
EA
Dyubko
S. F.
SF
Podnos
S. V.
SV
Kleiner
I.
Margulès
L.
L
Wlodarczak
G.
G
Demaison
J.
J
Cosléou
J.
J
Maté
B.
B
Karyakin
E. N.
EN
Golubiatnikov
G. Yu.
GY
Fraser
G. T.
GT
Suenram
R. D.
RD
Hougen
J. T.
JT