Solar Physics

, Volume 59, Issue 2, pp 353–356 | Cite as

Isotopic lines of SiO in sunspots

  • M. C. Pande
  • G. C. Joshi
Research Note


As the isotopic shift for the vibration rotation band is generally much larger than the isotopic shift for the corresponding electronic transitions and thus facilitating separation of isotopic lines, the vibration rotation bands of SiO may find use in the determination of isotopic abundance ratio Si28 ∶ Si29 ∶ Si30. To help identify the isotopic lines of SiO the wavenumbers for Si29O16 and Si30O16 have been calculated with an uncertainty of ±0.05 cm−1.

Taking note of the fact that SiO shows strong vibration rotation bands in the spectra of some cool stars the equivalent width calculations for P(40) and R(40) lines of the 1-0 and 2-1 vibration rotation bands of Si29O16 and Si30O16 have been made at the centre of the disc for the model ZSM-74 using two values of isotopic abundance ratio and three values of dissociation energy.

The search for the isotopic lines of SiO near 7 to 8μm is recommended in low noise centre to limb sunspot spectrum scans with a view to help improve the isotopic ratio Si28 ∶ Si29 ∶ Si30 and oscillator strengths for the vibration-rotation transitions.


Isotopic Ratio Electronic Transition Oscillator Strength Dissociation Energy Isotopic Shift 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© D. Reidel Publishing Company 1978

Authors and Affiliations

  • M. C. Pande
    • 1
  • G. C. Joshi
    • 1
  1. 1.Uttar Pradesh State ObservatoryNaini TalIndia

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