Recovery of Legacy Paper Spectra and New Results on the Rotational Spectrum of H_2O\cdotsHF

Physics

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Microwave

Scientific paper

The situation when a spectrum exists only in the form of a paper record and contains valuable unprocessed information is not that rare. In the case of broadband spectra with a rich information content it is very desirable to convert such spectra into a digital form that will be amenable for use with contemporary packages for graphical assignment.
The RAD spectrum of the H_2O\cdotsHF hydrogen bonded dimer recorded in the 1980's at Nizhny Novgorod is an example of such a valuable legacy spectrum. Only a small proportion of the lines in this spectrum have been assigned and measured. A special software package has been written to convert the original spectrum from many strip chart records into a unified, calibrated digital spectrum, which covers the frequency region 182-352 GHz and 11 succesive J+1← J transitions. The package is described in detail, is expected to be of universal applicability, and has been made available on the PROSPE website. Initial results concerning the analysis of this spectrum are reported, and it is aimed to considerably improve the understanding of the internal dynamics in H_2O\cdotsHF over that reached earlier on the basis of the cm-wave rotational spectrum.
Z.Kisiel et al., J. Mol. Spectrosc., 233, 231-243 (2005).
S.P.Belov et al., J. Mol. Spectrosc., 241, 124-135 (2007).
Z.Kisiel, Programs for ROtational SPEctroscopy, available at http://info.ifpan.edu.pl/ kisiel/prospe.htm.
Z.Kisiel, A.C.Legon, D.J.Millen, Proc. Roy. Soc. Lond. A, 381, 419-442 (1982).

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