I. Mukhopadhyay et al., LASER STARK AND FOURIER-TRANSFORM SPECTROSCOPY AND ASSIGNMENT OF OPTICALLY PUMPED FAR-INFRARED LASER LINES OF METBANOL-D-4, SPECT ACT A, 54(10), 1998, pp. 1307-1317
Citations number
23
Categorie Soggetti
Spectroscopy
Journal title
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
In this work, the Fourier transform far infrared (FTFIR) and infrared
(IR) spectra of the completely deuterated methanol species CD3OD corre
sponding to the torsion-rotation band in the vibrational ground state
and the C-O stretch vibrational band, respectively, have been recorded
and analyzed. From the IR analysis it has been possible to partially
identify optically pumped FIR laser lines for four different CO2 laser
pump systems from analytical considerations. In addition, laser Stark
spectra have been studied using the HCN laser lines operating at 311
and 337 mu m, in CD3OD. A number of Q-branch lines for K = 11<-- 10 E-
2 n = 0 assigned earlier and two strong R-branch transitions viz. R(8)
and R(10) for K = 7 <-- 6 A n = 0 have been considered. The laser Sta
rk spectrum for the R(10) transition has been reassigned from the prev
ious work. The availability of the zero field frequencies with a preci
sion of +/- 6 MHz from the high resolution FTFIR spectrum allowed the
dipole moment of this important molecular species to be determined for
the first time. The results will be useful for accurate intensity cal
culation and prediction of optically pumped FIR laser lines and astrop
hysically significant transitions. (C) 1998 Elsevier Science B.V. All
rights reserved.