Field Paper Published in Physical Review Letters

Danielle Randall
April 11, 2016

Stark Interference of Electric and Magnetic Dipole Transitions in the A − X Band of OH

H. Christian Schewe, Dongdong Zhang, Gerard Meijer, Robert W. Field, Boris G. Sartakov, Gerrit C. Groenenboom, Ad van der Avoird, and Nicolas Vanhaecke

Phys. Rev. Lett. 116, 153001 – Published 11 April 2016


An experimental method is demonstrated that allows determination of the ratio between the electric (1) and magnetic (M 1) transition dipole moments in the A − X band of OH, including their relative sign. Although the transition strengths differ by more than 3 orders of magnitude, the measured M 1-to-E 1 ratio agrees with the ratio of the ab initio calculated values to within 3%. The relative sign is found to be negative, also in agreement with theory.

Professor Field's current research interests include: the development of advanced pattern recognition techniques to extract dynamical information (isomerization, intramolecular proton transfer, energy flow, and fluxional behavior) from highly excited vibrational spectra of polyatomic molecules; spectroscopic characterization of triplet states of small polyatomic molecules, especially the doorway-mediated mechanism of Intersystem Crossing; and the mechanisms of energy exchange between electronic and nuclear degrees of freedom, through the spectroscopic study of core-nonpenetrating Rydberg states of diatomic molecules.