Photo- and autoionization processes of superexcited iodine atoms in MPI of CH3I and HI

Branching ratios in the dissociative photoionization of iodomethane by photoelectron photoion coincidence

“…Superexcited I** formation has also been observed in the two-photon excitation of molecular iodine followed by one-photon ionization and autoionization in multiphoton ionization experiments. 69 As discussed in the CH n I + section, the iodine cation may also be the fragmentation product of CH 2 I + above 17.60 eV (18). Most excess energy is available in the first dissociation step and the kinetic energy release will overwhelmingly affect the leaving neutral hydrogen atom in this case.…”

High energy state interactions, energetics and multiphoto-fragmentation processes of HI

“…The δ ( l ) values are characteristic for Rydberg state series and have been found to be close to those of the iodine atom ( i.e. about 4.00, 3.50, 2.40 and 0.05 for the s( l = 0), p(1), d(2) and f(3) Rydberg electrons, respectively 52 ) within the ranges of about 3.5–3.7, 2.3–2.5 and 1.0–1.3 for the p(1), d(2) and f(3) HI molecule Rydberg electrons, which are relatively large values due to the heavy iodine atom. 44 Fourth, vibrational quantum numbers, v ′, for ion-pair vibrational states are labelled as v ′ = m + i , where m and i are positive integers; m is unknown whereas i ranges from zero upwards.…”