High resolution photoelectron spectrometry of negative ions: Fine-structure transitions in O? and S? photodetachment

Abstract

The energy spectra of electrons detached from O-and S ions by 488.0nm and 514.5 nm photons have been measured with high electron energy resolution (5 meV) in order to determine the branching ratios for the various 2P3/2.1/2 --" aP2, 1.o fine-structure transitions together with their respective angular distributions. Detailed information on the relative importance of the s-and d-wave continuum is obtained.

Vibronic coupling in the superoxide anion: The vibrational dependence of the photoelectron angular distribution

“…58,[63][64][65][66][67][68] In these cases, the change in ␤ can be explained through consideration of the dominant long range term in the potential, the centrifugal term. The free electron wave can be represented as a superposition of partial angular momentum waves for which we will use the symbol ᐉЈ ͑=ᐉ Ϯ 1͒ to allow distinction from the parent orbital angular momentum quantum number ᐉ.…”

Low-energy photoelectron imaging spectroscopy of nitromethane anions: Electron affinity, vibrational features, anisotropies, and the dipole-bound state

“…The PE imaging spectrometer is calibrated using the known 19 PE spectrum of S − , using the second harmonic of a nanosecond-pulsed Nd:yttrium aluminum garnet laser ͑ = 532 nm͒. The S − ions are produced in dissociative electron attachment to CS 2 , entrained into the Ar expansion.…”

Negative Ion Spectroscopy

“…For personal use only. Eyler (23) Dunbar (22) Larsen (24) Moseley (18) Beyer (19) Lineberger (17,25) Hotop (14,44) Lineberger (40,42) Lineberger ( tube studies of atomic halogen negative ions (34), such experiments appear extremely difficult with molecular negative ions, and this plasma absorption technique is not currently in use. Other available product detection techniques include detection of ionic fragments, depletion of the parent negative ion population, detection of the neutral photode struction products, and detection of the photoelectrons.…”

“…All ion beam studies to date (8,14,15) have also incorporated mass analysis in the ion transport from the source to the photon interaction region. While beam methods are essential for photoelectron studies, they have also been used extensively in threshold photodetachment measurements (15)(16)(17).…”

“…Both pulsed (17,25) and continuous (14,17) tunable laser sources have been used for negative ion photodetachment studies. The first tunable laser measurements of S -photodetachment (26) were made with a flashlamp pumped pulsed tunable dye laser.…”