title: Rovibrational Constants for the nu(6) and 2nu(9) Bands of HCOOD by Fourier Transform Infrared Spectroscopy.
abstract: The Fourier transform infrared spectrum of the nu(6) and 2nu(9) bands of deuterated formic acid (HCOOD) was recorded with an apodized resolution of 0.004 cm(-1) in the frequency range of 930-1040 cm(-1). These two bands with band centers 40 cm(-1) apart were mutually coupled by Coriolis and Fermi interactions. By fitting a total of 1076 infrared transitions of both nu(6) and 2nu(9) with a standard deviation of 0.00075 cm(-1) using a Watson's A-reduced Hamiltonian in the I(r) representation with the inclusion of c-type Coriolis and a Fermi-resonance term, two sets of rovibrational constants for v(6) = 1, and v(9) = 2 states were derived for the first time. Both nu(6) and 2nu(9) bands are A type with band centers at 972.8520 +/- 0.0001 and 1011.6766 +/- 0.0001 cm(-1), respectively. Copyright 1999 Academic Press.
authors.affiliation: School of Science, Nanyang Technological University, National Institute of Education, 469, Bukit Timah Road, Singapore, 259756, Singapore
authors.initials: TL
authors.lastname: Tan
authors.initials: KL
authors.lastname: Goh
authors.initials: PP
authors.lastname: Ong
authors.initials: HH
authors.lastname: Teo