Direct observation of electronic structures of KRb by resonance enhnaced two photon ionization spectroscopy (RE2PI) in a supersonic molecular beam

Abstract

Resonance enhanced two photon ionization spectrum of KRb was observed by using a very cold pulsed molecular beam. The spectrum shows six vibrational progressions in the range of 436~ 460 nm. The isotopic shift of the vibrational energy enabled us to determine the absolute vibrational quantum number. From the Birge-Sponer analysis and LeRoy-Bernstein analysis the binding energies of the involved electronic states are obtained. Furthermore the electronic term value($T_e$) and harmonic vibrational frequency($ω_e$) of KRb were calculated.