Solar Physics

, Volume 291, Issue 8, pp 2243–2252 | Cite as

Spectropolarimetry of Atomic and Molecular Lines near 4135 nm

  • Matthew James Penn
  • Han Uitenbroek
  • Alan Clark
  • Roy Coulter
  • Phil Goode
  • Wenda Cao


New spatially scanned spectropolarimetry sunspot observations are made of photospheric atomic and molecular absorption lines near 4135 nm. The relative splittings among several atomic lines are measured and shown to agree with values calculated with configuration interaction and intermediate coupling. Large splitting is seen in a line identified with Fe i at 4137 nm, showing multiple Stokes V components and an unusual linear polarization. This line will be a sensitive probe of quiet-Sun magnetic fields, with a magnetic sensitivity of 2.5 times higher than that of the well-known 1565 nm Fe i line.


Solar magnetic fields Solar atmosphere Detectors 



We wish to thank Robert Kurucz for clarifying discussions and the anonymous referee for a thorough review. NSO is operated by AURA Inc., under contract to the National Science Foundation. PG acknowledges AFOSR grant FA9550-15-1-0322.

Disclosure of Potential Conflicts of Interest

The authors declare that they have no conflicts of interest.


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Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  • Matthew James Penn
    • 1
  • Han Uitenbroek
    • 2
  • Alan Clark
    • 3
  • Roy Coulter
    • 4
  • Phil Goode
    • 4
  • Wenda Cao
    • 4
  1. 1.National Solar ObservatoryTucsonUSA
  2. 2.National Solar ObservatorySunspotUSA
  3. 3.Dept. of Physics and AstronomyUniversity of CalgaryCalgaryCanada
  4. 4.Big Bear Solar ObservatoryBig BearUSA

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