We present 92 cm observations of the high-redshift galaxy B2 0902+343 ( z=3.40 ) with the Westerbork Synthesis Radio Telescope ( WSRT ) .
Twenty-one cm H i is detected in absorption , at a depth of 15.9 mJy ( = 6 \sigma ) and rest frame velocity width 120 km s ^ { -1 } .
We also report a null detection of OH emission or absorption at the 1665/1667 MHz rest-frame transitions .
Based on our spectral sensitivity , we derive an upper limit on OH maser luminosity of \log ( L / L _ { \sun } ) < 5.2 .
In addition , we consider the possibility of absorption , and estimate a maximum column depth N ( OH ) of 1 \times 10 ^ { 15 } ~ { } \mathrm { cm } ^ { -2 } , corresponding to at most 2 \times 10 ^ { 5 } -9 \times 10 ^ { 6 } \mathrm { M } _ { \sun } of OH in the galaxy .
The implications of these results are discussed in the context of current efforts to extend the OH megamaser luminosity function and galactic merger rate to high redshift .