Addition to the analysis of Y VII, VIII and Mo X

With the help of newly recorded spectrograms, the seven hitherto unknown levels of the 4p²4d configuration of Y VII and Mo X have been determined, and three previously reported level values of Y VII are improved upon. Eight new levels of 4s4p³ of Y VIII are added to the only two of this configuration which were already known. This completes the structural knowledge of the four lower configurations of Y VIII, namely 4s²4p², 4s4p³, 4s²4p4d and 4s²4p5s.