Vibrational Progressions and Rydberg Series ofO2and NO

Abstract
Resonances for collisions of electrons with O2 and NO are studied by measuring the derivative of the current transmitted through NO and O2. In both these gases we find vibrational progressions of compound states. The spacings and Franck-Condon factors for these progressions agree with those of the respective positive ions. Thus it appears that these compound states consist of two Rydberg electrons loosely attached to the ion core.