O2 Microwave Spectrum
Main Isotope
This shows an example of a microwave spectrum using a magnetic moment. The values are
taken from G.Yu. Golubiatnikov and A.F. Krupnov, J Molec. Spectrosc. 225, 222 (2004), but with γH
= 0,
which gives a better fit to the experimental data. It gives good, but not exact agreement with their calculated
values. The values calculated by PGOPHER have been checked against the
explicit formulae given in Rouille at al, J Molec. Spectrosc. 154, 372 (1992) so the discrepancy
is probably due to a slight difference in the method of calculation.
Data file: o2fittedmuwave.pgo. Note the following:
- Symmetric = True for the molecule
- AsymWt = 0 to reflect the fact that half the rotational levels are missing as 16O has spin 0.
18O16O
This is the microwave spectrum of the 18O16O
species. The constants were obtained by fitting to the observed microwave lines given in the JPL Molecular Spectroscopy catalog (H. M. Pickett,
R. L. Poynter, E. A. Cohen, M. L. Delitsky, J. C. Pearson, and H. S. P. Muller,
"Submillimeter, Millimeter, and Microwave Spectral Line Catalog,"
J. Quant. Spectrosc. & Rad. Transfer 60, 883 (1998)) λH was fixed to the value for 16O2.
Data file: o18ground.pgo Note the following differences:
- Symmetric = False for the molecule (no u/g for this isotope) and AsymWt = 1 as nuclear spin statistics have no effect here
17O16O
This is the microwave spectrum of the 17O16O
species. The constants were obtained by fitting to the data from Fit to data from G. Cazzoli et al., Nuovo Ciminto 62, 243 (1981) obtained from the JPL Molecular Spectroscopy catalog. The centrifugal distortion constants were fixed to the value for 16O2.
Data file: o17ground.pgo Note the following differences:
- Symmetric = False for the molecule (no u/g for this isotope)
- nNuclei = 1, as 17O has spin 5/2 (and 3 hyperfine parameters are determined by the data).
All isotopes
This file combines all the above. Data file: o2allground.pgo Note the following differences:
- Abundance has been set as appropriate
- The hyperfine structure has been turned off in the 17O16O species to simplify the spectrum.
- Colours
have been set on the spectrum so that individual spectra will show in
different colours, as in the sample below (Green = 17O16O, Blue = 18O16O; the main isotope is in red but does not show in this picture).
