3(1)PI(U) AND 3(1)SIGMA(+)(U) STATES OF K-2 STUDIED BY A POLARIZATION-LABELING SPECTROSCOPY TECHNIQUE

The 3 Πu1X g+1 and 3 u+1X g+1 band systems of K2 are studied by the polarization-labeling spectroscopy method. An observation of isotope shifts of rotationally resolved lines in both systems reveals that the previous vibrational numbering in the 3 Πu1 and 3 u+1 states is incorrect by 1 and 3 vibrational quanta, respectively. An analysis is carried out for both states. We present the resulting molecular parameters that describe the 3 Πu1 state to 55% and the 3 u+1 state to 71% of their potential well depths. © 1995 The American Physical Society.