1997/11/15 by Martin T. Zanni, Travis R. Taylor, B. Jefferys Greenblatt +2 · 1 citation
Physics and Astronomy · Engineering · Chemistry · #Advanced Chemical Physics Studies #Spectroscopy and Quantum Chemical Studies #Molecular Junctions and Nanostructures #X-ray photoelectron spectroscopy #Femtosecond #Ion #Ground state #Electron affinity (data page) #Spectroscopy #Raman spectroscopy #Femtochemistry #Atomic physics #Analytical Chemistry (journal) #Adiabatic process #Morse potential #Materials science #Nuclear magnetic resonance #Chemistry #Laser #Optics #Physics #Molecule
paper · doi:10.1063/1.475110
openalex publication_date 1997/11/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/11
The X̃ 2Σu+ state of the I2− anion has been fit to a Morse potential using data from two techniques: conventional and femtosecond photoelectron spectroscopy (FPES). Conventional photoelectron spectroscopy is used to determine the adiabatic electron affinity of I2 as well as the well depth and equilibrium nuclear geometry of I2−. In the FPES experiment, the pump pulse induces coherent nuclear motion on the ground state of I2− by resonant impulsive stimulated Raman scattering (RISRS), and the vibrational frequency of the anion is determined from the resulting oscillatory structure in the time-dependent photoelectron spectra. We find the electron affinity (EA) of I2 to be 2.524±0.005 eV, the well depth (De) for I2− to be 1.014±0.005 eV, the equilibrium internuclear separation (Re) to be 3.205±0.005 Å, and the vibrational frequency to be 110±2 cm−1. These values for the I2− potential parameters differ significantly from previous results.