Spectroscopy of the B1Πu—X1Σ+g system of K2 using the fluorescence induced by a Kr+ laser

The two red lines of a Kr + laser are used to excite the B 1 Π u state of K 2 . Analysis of the fluorescence data, combined with those obtained by Tango, Link and Zare on He—Ne laser excitation, yields improvement to five molecular constants of the excited B state.