RT Journal Article
T1 Reinvestigation of the ground and first torsional state of methylformate
A1 Carvajal Zaera, Miguel
A1 Willaert, F.
A1 Demaison, J.
A1 Kleiner, I.
K1 Espectroscopia molecular
AB We have reinvestigated the laboratory spectrum for the methylformate HCOOCH3 molecule involving both the ground and firstexcited torsional states.We have fitted within almost experimental accuracy a data set for this molecule consisting of 3496 vt ¼ 0 and 774 vt ¼ 1 microwavelines, using the so-called ‘‘rho axis method’’ (RAM) and a model extended to include perturbation terms through eighth order. The previouslypublished vt ¼ 0 and vt ¼ 1 microwave lines covering the J values up to 43 in the ground state and up to 18 in the first excitedstate have been extended by 434 new measurements from Lille in the 567–669 GHz spectral range, corresponding to transitions withJmax ¼ 62, Kmax ¼ 22 in vt ¼ 0. The final fit requires only 49 parameters to achieve a unitless weighted standard deviation of 1.43 fora total of 4270 lines for the whole fit. This result represents an improvement over the previous fit which achieved a standard deviationof 1.96 for 3862 lines using 69 parameters. A calculation of the line strengths of torsion–rotation transitions up to J = 60 needed for theastronomical survey is also provided.
PB Elsevier
SN 0022-2852
YR 2007
FD 2007-12
LK http://hdl.handle.net/10272/5423
UL http://hdl.handle.net/10272/5423
LA eng
NO Carvajal Zaera, M., Willaert, F., Demaison, J., Kleiner, I.: "Reinvestigation of the ground and first torsional state of methylformate". Journal of Molecular Spectroscopy. Vol. 246, n. 2, p. 158-166 (2007). ISSN: 0022-2852
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026