Our KAO observations of the Galactic center arched filaments show that
 the FIR excitation is consistent with ionization by stars, as opposed
 to more exotic phenomena such as magnetohydrodynamic induced
 ionizations.  Our subsequent ground-based observations have revealed
 a tight cluster of probable WN8-9 stars located near the E1 Filament.
 Based on our HII region models, an excitation gradient in the FIR
 lines will be evident if the cluster is responsible for the ionization
 of the E1 Filament. We propose observations of [SIII] (33 microns),
 [SiII] (35 microns), [OIII] (52 and 88 microns), [NIII] (57 microns),
 [OI] (63 microns), [NII] (122 microns), [CII] (158 microns) and
 the 40-196 micron continuum at 3 positions at varying distances from
 the G0.12+0.02 cluster to test whether this cluster photoionizes the
 arched filaments and the relationship between the cluster and an
 adjacent molecular cloud.