The experimental data was summarized by
(1) M. Winnewisser, B. P. Winnewisser, M. Stein, M. Birk, G. Wagner,
G. Winnewisser, K. M. T. Yamada, S. P. Belov,and O. Baskakov,
2002 J. Mol. Spectrosc. 216, 259.
The published FT-FIR transitions have not been merged.
According to
(2) W. H. Hocking, 1976
Z. Naturforsch. 31a, 1113,
cis-HCOOH is about
1365 cm1 higher in energy than the
trans conformer.
The dipole moment was measured in (2).
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