The vibrational transitions of the photochemical reaction products in phenol-(NH3)(2) have been measured by infrared (IR) dip spectroscopy. Two sharp bands at similar to 3200 cm(-1) and a broad band in the region 2700 similar to 3100 cm(-1) are observed. The spectrum is clearly different from that of the cluster in So, and also largely different from the IR spectrum of NH4+(NH3)(2). This suggests that hydrogen transfer occurs in electronically excited phenol-(NH3)(3). Evidence of hydrogen transfer has also been found in phenol-(NH3)(3) based on the mass spectrum and the IR dip spectrum of the cluster.