Commercially available boron triiodide (stated to be 99.9%
pure) was flash photolysed and found to contain a high level
of impurity. After a lengthy purification procedure the
sample was still too impure to be of use. Boron triiodide
was, therefore, prepared by several methods and shown to be
free of impurities by mass spectrometry. A detailed study of
these preparative methods has removed many of the
ambiguities present in the existing literature. The
absorption spectrum of the water sensitive pure B13 vapour
was recorded over the range 650-200nm and shown to consist
of six absorption maxima ie. transitions to six electronic
states of the B13 molecule were detected......
Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.