Resolving the F₂ bond energy discrepancy using coincidence ion pair production (cipp) spectroscopy

Abstract

Coincidence ion pair production (cipp) spectra of F2 were recorded on the DELICIOUS III coincidence spectrometer in the one-photon excitation region of 125 975–126 210 cm–1. The F+ + F–...

Coincidence ion pair production (cipp) spectroscopy of diiodine

“…The coincidence ion pair production experiments were carried out in an electric field and, as previously noted, 16 the cipp spectral lines may be susceptible to Stark shifts. Therefore, the experiments were carried out at three different extraction fields: 17.7, 44.3, and 88.7 V cm À1 .…”

“…The lowest-energy observed Rydberg state lacked some of the predicted rotational structure, which allowed an accurate determination of the ion pair production threshold which, together with pepico experiments carried out on the same apparatus, allowed us to determine the previously disputed F 2 dissociation energy with unprecedented accuracy. 16 In this paper, we present coincidence ion pair production (cipp) spectra for I 2 , which allowed identification of a large number of Rydberg states. Detailed analyses of the spectra and reanalysis of older absorption data 1 revealed a number of new states and complete reassignment of some I 2 molecule Rydberg states.…”

Photoelectron Photoion Coincidence Spectroscopy Provides Mechanistic Insights in Fuel Synthesis and Conversion

“…45−48 Continuous extraction of photoelectrons and photoions yields better signal levels and allows for more versatile applications than highresolution pulsed field approaches, 49 while still being capable of sub-meV (better than 0.1 kJ mol −1 ) overall energy resolution in favorable cases. 50,51 By photoelectron kinetic energy analysis, the analytical dimension, and thus, the selectivity, of MPIMS is expanded by a further dimension, i.e., the photoelectron spectrum, which often offers an isomerspecific fingerprint.…”

“…In PEPICO (Figure (a)), a gas-phase sample is ionized by tunable monochromatic vacuum ultraviolet (VUV) radiation, corresponding to the energy range of valence photoionization. Synchrotrons represent the most intense and easily tunable VUV light sources, which is why, similar to PIMS and MPIMS experiments, contemporary PEPICO setups are mostly found at VUV beamlines. − Continuous extraction of photoelectrons and photoions yields better signal levels and allows for more versatile applications than high-resolution pulsed field approaches, while still being capable of sub-meV (better than 0.1 kJ mol –1 ) overall energy resolution in favorable cases. , By photoelectron kinetic energy analysis, the analytical dimension, and thus, the selectivity, of MPIMS is expanded by a further dimension, i.e., the photoelectron spectrum, which often offers an isomer-specific fingerprint.…”

Photoionization of Two Potential Biofuel Additives: γ-Valerolactone and Methyl Butyrate

“…Furthermore, the appearance energy connects the enthalpies of formation of the neutral and the fragments in such cases and can often be used in thermochemical cycles to derive new energetics data, such as enthalpies of formation , or proton affinities . If there is a transition state at an energy higher than that of the products, the appearance energy can be used to determine the heat of formation of the activated complex accurately, which can be used, e.g., to benchmark computational approaches …”