SATURATION-DIP MEASUREMENTS IN THE $\nu_8$ C-O STRETCHING FUNDAMENTAL BAND OF METHANOL WITH A DUAL-MODE CO$_2$-LASER/MICROWAVE-SIDEBAND SPECTROMETER
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Date
2005
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Ohio State University
Abstract
We have extended the sub-Doppler spectroscopic study of the $\nu_8$ C-O stretching fundamental band of methanol with a dual-mode CO$_2$-laser/microwave-sideband spectrometer}}, 1052 (2004).}. A further 492 transitions, including a number of overlapped and doublet lines unresolved in the Doppler-limited spectra of the broadband scanning mode, have been observed as saturation dips with a resolution of 0.4 MHz in the sub-Doppler detection mode and their frequencies have been measured with accuracy of order $\pm$200 kHz. For $K$ from 1 to 5, energy term values for the excited-state levels of these $A$- and $E$-species transitions have been determined using known ground-state energies and have been fitted to Taylor-series expansions in powers of ${J(J+1)}$ to yield accurate expansion coefficients. The present, together with previous sub-Doppler measurements$^{a,}$}}, 2068 (2000).}, provide a high accuracy database for CH$_3$OH, with application to methanol vibrational interaction studies and the interpretation of the optically pumped far-infrared laser emission spectrum.
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{Z.-D. Sun, R.M. Lees, L.-H. Xu, M.Yu. Tretyakov, and V.V. Dorovskikh, Rev. Sci. Instrum. {\bf{75{Z.-D. Sun, F. Matsushima, S. Tsunekawa, and K. Takagi, J. Opt. Soc. Am. B {\bf{17
Author Institution: Department of Physical Sciences, University of New Brunswick, Saint John, NB, Canada E2L 4L5; Department of Physics, Yantai University, 264005, P. R. China; Department of Physical Sciences, University of New Brunswick, Saint John, NB, Canada E2L 4L5
Author Institution: Department of Physical Sciences, University of New Brunswick, Saint John, NB, Canada E2L 4L5; Department of Physics, Yantai University, 264005, P. R. China; Department of Physical Sciences, University of New Brunswick, Saint John, NB, Canada E2L 4L5