Knowledge Bank

The electronic absorption spectrum of BF has been investigated between 850 and $2000\backslash AA$. Two strong Rydberg series which approach limits at $1115\backslash AA$ and $1095\backslash AA$ have been found. These correspond to $(v\prime =0,v″=0)$ and $(v\prime =1,v″=0)$ progressions in the $(np\pi )$ series up to $n=15$ and 18, respectively. The $(ns\sigma )$ and $(np\sigma )$ series have been observed up to $n=6$ and 9, respectively. The first ionization potential is determined to be $89650\pm 30cm-1(11.115\pm 0.004eV)$. All of the observed electronic states can be assigned to Rydberg series, such that a semi-quantitative analysis of interaction between Rydberg states can be made.