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The Ground State Spectroscopic Constants of Formaldehyde

✍ Scribed by H.S.P. Müller; G. Winnewisser; J. Demaison; A. Perrin; A. Valentin

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
72 KB
Volume
200
Category
Article
ISSN
0022-2852

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✦ Synopsis

NOTE The Ground State Spectroscopic Constants of Formaldehyde

The ground state rotational spectrum of H 2 CO was recently remeasured from the microwave to the far-infrared regions (1-2600 GHz) (1). It permitted a great improvement in the accuracy of the rotational and centrifugal distortion constants. However, the subsequent analysis of the high-resolution infrared spectra in the 3.5-m region (2) indicates that these new parameters, although much better than the previous ones, are still not yet accurate enough to predict all the observed ground state combination differences (GSCD), particularly those with ⌬K a ϭ 2 at high values of K a . This is easy to explain because even if the J and K a values of the measured rotational spectrum span a rather extended range ( J Յ 44; K a Յ 12) of rotational quantum number, most of the observed MW or far-IR transitions do involve ⌬K a ϭ 0 transitions, except for those corresponding to very low K a values. Consequently, it is difficult to get information on the K a dependence of some rotational energy levels. This problem was already encountered earlier and was solved by combining the microwave data with GSCD from infrared and ultraviolet spectroscopy (3).

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