A FULL IAM ANALYSIS OF TORSION IN THE GROUND STATE MILLIMETER WAVE SPECTRUM OF METHYL FORMATE.

Nadgaran, H.; Baker, J. G.; Rezgui, N. D.

A FULL IAM ANALYSIS OF TORSION IN THE GROUND STATE MILLIMETER WAVE SPECTRUM OF METHYL FORMATE.

Files

1993-MH-07.jpg (93.49 KB)

Date

1993

Authors

Nadgaran, H.

Baker, J. G.

Rezgui, N. D.

Publisher

Ohio State University

Abstract

The rotational spectrum of methyl formate has been extensively measured and analysed by PAM methods up to high J $v a l u e s (1,2)$ . We have re-analysed these results by an IAM technique not calling for large matrix $d i a g o n a l i s a t i o n (3)$ and carried out further measurements in the 140-160 GHz band. The Hamiltonian used utilises a planar rotation which transforms the quartic and sextic centrifugal distortion terms to an internal axes $s y s t e m (4,5)$ . Our analysis gives comparable rms deviations with 10 fewer parameters, and leads to a 2.5% smaller $ν 3$ value of 391.592(168) $c m −1$ with slight changes in the rotation and centrifugal constants.

Description

1)Plummer G.M., Herbst E., De Lucia F.C. and Blake G.A., Astrophys.J.Suppl.Ser., 55, 633-656 (1984). 2)Plummer G.M., Herbst E., De Lucia F.C. and Blake G.A., Astrophys.J.Suppl.Ser., 60, 949-961 (1986). 3)Nadgaran H., Baker J.G., 47th International symposium on Molecular Spectroscopy'', Columbus, Ohio, USA, FD14 (1992). 4)Maes H., Wlodarczak G., Boucher D. and Demaison J.Z., Naturforsch, 42a, 97-102 (1987). 5)Nadgaran H., Baker J.G., Twelfth Colloquium on High Resolution Spectroscopy'', Dijon, France, J38 (1991).

Author Institution: c/o N.Riazi, Department of Physics, University of Shiraz; Schuster Laboratory., University of Manchester

URI

http://hdl.handle.net/1811/18491

Collections

Abstracts of OSU International Symposium on Molecular Spectroscopy 1990-1999

Full item page

Knowledge Bank