文摘
Apart from products H, B, BH, BH2 and BH3 identified from their emission spectra in the UV/Vis region, photolysis of diborane(6) dispersed in solid neon at 4 K with far-ultraviolet light from a synchrotron led to observation of absorption line (0,0) of the electronic transition A 3Σu−←X 3Σg− of B2 at 326.39 nm. Absorption lines (1,0) of 11B2, 11B10B and 10B2 were recorded at 316.63, 316.40 and 316.15 nm, respectively. ΔG1/2 of state A 3Σu− for 11B2, 11B10B and 10B2 in solid neon are accordingly derived to be 945, 968 and 993 cm−1, respectively. Weak lines (0,1) of 11B2 at 29586 cm−1 and of 11B10B at 29560 cm−1, corresponding to 1042±30 and 1068±30 cm−1 for vibrational modes in the electronic ground state, were recorded in emission. An absorption line recorded at 1066.5±0.5 cm−1 in infrared spectra after photolysis of either B2H6 in Ne or B2D6 with D2 in Ne is thus attributed to 11B10B.