Zero-kinetic-energy electron spectroscopy of the predissociatingA2Σ+

Abstract

The Rapid Communications section is intended for the accelerated publication of important new results. Since manuscripts submitted to this section are given priority treatment both in the editorial office and in production, authors should explain in their submittal letter why the work justifie this special handling ARa. pid Communication should be no longer than 4 printed pages and must be accompanied by an abstract. Page proofs are sent to authors.The rotationally resolved zero-kinetic-energy electron spectra for the v+ =1, 2, and 3 vibrational levels of the predissociating A X+ state of HBr+ are reported. The results for the rapidly predissociating v+ =2 and 3 levels show that the high principal quantum number Rydberg states involved in the zero-kinetic-energy spectroscopy are unperturbed by ion core fragmentation. These data demonstrate the general applicability of this technique for rotationally resolved photoelectron spectroscopy. R1

Chemical Applications of Zero Kinetic Energy (ZEKE) Photoelectron Spectroscopy

“…[77±81] Hepburn et al [82] recently recorded ZEKE spectra for the v 1 ± 3 levels of the predissociating A 2 S state of HBr by VUV excitation of high Rydberg states of HBr converging to the predissociating level. The ZEKE-PFI spectra were obtained with rotational resolution for both predissociating (v 2, 3) and nondissociative levels.…”

State Selective Predissociation Spectroscopy of Hydrogen Bromide Ions (HBr+) via the 2Σ+ ← 2Πi(i=1/2, 3/2) Transition

“…The important point is that there is a total of six allowed optical transitions for each rotational state in the 2 Π 1/2 (except for the R′′ ) 0 state, for which there are only four allowed transitions). The nomenclature used in this work to characterize the observed transitions is P 12 …”

Bond‐dissociation energies of cations—Pushing the limits to quantum state resolution

“…The first electronically excited state of the HBr þ ion, the A 2 AE þ state has a minimum which is lower in energy than the above-mentioned dissociation threshold of interest (Banichevich, Klotz, & Peyerimhoff, 1992;Mank et al, 1995). This bound A state is crossed by three repulsive electronic states ð 4 AE À ; 2 AE À ; 4 PÞ, coupling to which leads to predissociation above a certain quantum state in the A state at the dissociation limit of the X state.…”