Optical zeeman spectroscopy of the (0, 0) A 2Π-X 2Σ+ band system of magnesium hydride

Ruohan Zhang, Timothy Steimle

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


The Zeeman effect on lines in the (0, 0) A 2Π-X 2Σ+ band system of a cold molecular beam sample of magnesium hydride, MgH, has been recorded at high resolution (FWHM ≅60 MHz) and analyzed. The lines associated with the lowest rotational levels are detected for the first time. The field-free spectrum was analyzed to produce spectroscopic parameters for the A 2Π (v = 0) state. The experimentally observed magnetic tuning of the low-rotational spectral features at field strengths comparable to those found in sunspots is accurately modeled by assuming that the electronic spin and orbital magnetic g-factors, g S and gL, of the A 2Π and X 2Σ+ states are 2.002 and 1.000, respectively, and gl is-0.0023 for the X 2Σ+.

Original languageEnglish (US)
Article number51 (7pp)
JournalAstrophysical Journal
Issue number1
StatePublished - 2014


  • Sun: magnetic fields
  • methods: laboratory: molecular
  • molecular data
  • stars: magnetic field

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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