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We present polarimetric maser observations with the Australia TelescopeCompact Array (ATCA) of excited-state hydroxyl (OH) masers. We observed 30fields of OH masers in full Stokes polarization with the Compact ArrayBroadband Backend (CABB) at both the 6030 and 6035 MHz excited-state OHtransitions, and the 6668-MHz methanol maser transition, detecting 70 sites ofmaser emission. Amongst the OH we found 112 Zeeman pairs, of which 18 exhibitedcandidate {\pi} components. This is the largest single full polarimetric studyof multiple sites of star formation for these frequencies, and the rate of 16%{\pi} components clearly indicates the {\pi} component exists, and iscomparable to the percentage recently found for ground-state transitions. Thissignificant percentage of {\pi} components, with consistent proportions at bothground- and excited-state transitions, argues against Faraday rotationsuppressing the {\pi} component emission. Our simultaneous observations ofmethanol found the expected low level of polarisation, with no circulardetected, and linear only found at the less than or equal to 10% level for thebrightest sources.

Excited-state hydroxyl maser polarimetry: Who ate all the {\pi}s?