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Accurate transition probabilities for forbidden lines are importantdiagnostic parameters for low-density astrophysical plasmas. In this paper wepresent experimental atomic data for forbidden [FeII] transitions that areobserved as strong features in astrophysical spectra.  Aims: To measure lifetimes for the 3d^6(^3G)4s a ^4G_{11/2} and 3d^6(^3D)4s b^4D_{1/2} metastable levels in FeII and experimental transition probabilitiesfor the forbidden transitions 3d^7 a ^4F_{7/2,9/2}- 3d^6(^3G)4s a ^4G_{11/2}.  Methods: The lifetimes were measured at the ion storage ring facility CRYRINGusing a laser probing technique. Astrophysical branching fractions wereobtained from spectra of Eta Carinae, obtained with the Space Telescope ImagingSpectrograph onboard the Hubble Space Telescope. The lifetimes and branchingfractions were combined to yield absolute transition probabilities.  Results: The lifetimes of the a ^4G_{11/2} and the b ^4D_{1/2} levels havebeen measured and have the following values, 0.75(10) s and 0.54(3) srespectively. Furthermore, we have determined the transition probabilities fortwo forbidden transitions of a ^4F_{7/2,9/2}- a ^4G_{11/2} at 4243.97 and4346.85 A. Both the lifetimes and the transition probabilities are compared tocalculated values in the literature.

The FERRUM project: Transition probabilities for forbidden lines in [FeII] and experimental metastable lifetimes