Dynamics studies using Rydberg atom time-of-flight spectroscopy.

摘要

The Rydberg atom time-of-flight method has been employed for velocity, angular and spin orbit state resolved detection of oxygen atoms, O ( 3P_J). The atoms were “tagged” by double-resonance two-photon excitation to high-n Rydberg levels and subsequently field ionized at a detector. This method was characterized by studying a well-known system, the photodissociation of NO₂ at 355 nm. From the time-of-flight spectra of the nascent O (3P_J) products, information about the internal energy distribution of the diatomic counterfragment was obtained.; The OH + D₂ → HOD + D reaction has been studied at a collision energy of ∼9 kcal/mol, above the threshold for formation of the HOD product with three quanta of OD local stretching excitation. It was found that the newly formed OD bond was preferentially excited to v = 2, in agreement with recent theoretical predictions.