a b s t r a c tThe decomposition mechanisms of H 3 NBH 3 , (BH) 3 (NH) 3 , and B(CH 3 ) 3 on heated W wire surfaces were examined using mass spectrometric and laser spectroscopic techniques. These chemicals can be source materials for catalytic chemical vapor deposition as well as for B-atom doping. All the species could be decomposed well when the wire temperature was over 2.0 × 10 3 K. When H 2 was introduced, the production of B atoms was confirmed in the decomposition of H 3 NBH 3 and B(CH 3 ) 3 , but not for (BH) 3 (NH) 3 . H 3 NBH 3 and B(CH 3 ) 3 may be candidates as safe precursors for B-atom doping, while (BH) 3 (NH) 3 could be a viable candidate as a BN film precursor.