Electron affinity potential energy curves

The potential energy curves of the species AB, AB+, and AB- are used in figure 4.1 to summarize the definitions of the adiabatic ionization energy and electron affinity of AB. Note that the arrows start and end at vibrational ground states (vibrational quantum number v = 0). 

Inorganic chemistry concerns molecules of all the atoms. The electron affinities of atoms, small molecules, and radicals and their relationship with the Periodic Table, electronegativities of elements, Morse curves of diatomic anions, and the energies of ion molecule reactions and bond energies are inorganic problems we have considered. Ionic radii can be estimated using potential energy curves. 

Figure 2.1 Morse potential energy curves for the neutral and negative-ion states of F2. The vertical electron affinity VEa, adiabatic electron affinity AEa, activation energy for thermal electron attachment E, Err — AEa — VEa, EDEA — Ea(F) — D(FF), and dissociation energy of the anion Ez are shown.

Figure 4.11 Morse potential energy curves for chloronaphthalene and its ions. The curves are calculated using the activation energy and electron affinity determined from the data in Figure 4.10. The high-temperature data are for sequential dissociation. For the two lowest curves the VEa and EDEA are negative, but molecular ion formation precedes dissociation in the Franck Condon transition.

Figure 7.17 Current best Morse potential energy curves for benzene and its anions. There are two additional antibonding curves going to each dissociation limit that are not shown. The adiabatic electron affinity corresponds to the polarization curve.

The homonuclear diatomic molecules are the simplest closed set of molecules. Many of the electron affinities of the main group diatomic molecules have been measured by anion photoelectron spectroscopy (PES), but only a few have been confirmed. These Ea can be examined by their systematic variation in the Periodic Table. Calculating Morse potential energy curves for the anions and comparing them with curves for isoelectronic species confirm experimental values. The homo-nuclear diatomic anions of Group IA, IB, VI, VII, and 3d elements and NO are examined first. 

Electron Affinities and Morse Potential Energy Curves ... 

ELECTRON AFFINITIES AND MORSE POTENTIAL ENERGY CURVES SULFUR FLUORIDES AND ANIONS... 

Thermal electron attachment to SF6 has been studied in the ECD and NIMS at atmospheric pressure and in a chemical ionization mass spectrometer at lower pressures. From these data rate constants for thermal electron attachment and detachment to SF6, and the Qan values and electron affinities of SF6 and SF5 have been determined. The Morse potential energy curves for multiple negative-ion states were calculated using electron impact data and electron affinities. 

The electron affinities of several triatomic molecules and the azide radical have been evaluated and are supported by the CURES-EC method. The molecules that are linear in the neutral and bent in the anion have been emphasized. The ECD data support two negative-ion states. Morse potential energy curves for N20 and CS2 have been constmcted for the linear and bent ions. The relative energies of the anion and neutrals for C02, COS, CS2, and N20 were presented to explain the electron attachment data. The electron affinities of the SF molecules n = 1 to 6 were evaluated and the largest values assigned to the ground state. 

ELECTRON AFFINITIES AND POTENTIAL ENERGY CURVES FOR NITROBENZENE AND NITROMETHANE... 

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