부산대학교 도서관

We report on the characterisation of the lowest three electronic states of MgKr + , the X + 2 Σ + ground state associated with the Mg + (3s) 2 S 1 / 2 + Kr(4p) 6 1 S 0 dissociation limit and the A + 2 Π Ω (Ω = 1 / 2 , 3 / 2) and B + 2 Σ + excited states associated with the Mg + (3p) 2 P 1 / 2 , 3 / 2 + Kr(4p) 6 1 S 0 dissociation limits. The vibrational structure of the X + ground state was measured by pulsed-field-ionisation zero-kinetic-energy photoelectron spectroscopy starting from the a 3 Π 0 metastable state of MgKr generated by laser ablation of a Mg rod in a Kr supersonic beam. The vibrational assignment was derived from the isotopic structure of the spectra and the adiabatic ionisation energy of the a → X + ionising transition was determined to be 38182.4(2.0) cm − 1 . Partially rotationally resolved spectra of the A + ← X + and B + ← X + transitions were recorded by monitoring the yield of Mg + ions produced by dissociation of MgKr + using the technique of isolated-core Rydberg-dissociation spectroscopy. Analytical potential-energy functions of the X + , A + , and B + states were derived using a global model of these states that includes the spin-orbit interaction. The observation of the highest vibrational levels of the B + state and the onset of the Kr + Mg + (3p) dissociation continuum enabled the precise determination of the dissociation energies of the X + , A + and B + states of MgKr + and of the a state of MgKr. The X + , A + and B + states of MgKr + are important stepping stones to access the Rydberg states of MgKr + and the ground state of MgKr 2 + by resonant multiphoton excitation. [ABSTRACT FROM AUTHOR]