Spectropolarimetry of Atomic and Molecular Lines near 4135nm
Abstract
New spatially scanned spectropolarimetry sunspot observations are made of photospheric atomic and molecular absorption lines near 4135nm. 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 4137nm, 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 larger than that of the well-known 1565nm Fe I line.
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