Time-sliced ion imaging study of I2 and I2+ photolysis at 532 nm
Abstract
Photodissociation of I2 and I2+ at 532.10 nm was studied using VUV photoionization/time-sliced velocity map imaging. The dissociation energies D0 of I2(X 1Σ+g) and I2+(X 2Π1/2g) were found to be 12 416 ± 48 and 16 439 ± 48 cm−1, respectively. Absorption of 532.10 nm mainly corresponds to the excitation of I2(X 1Σ+g) to the 1Π(1u) and/or A3Π(1u) states, and the excitation of I2+(X 2Π1/2g) to the A2Π1/2u state, with a small fraction to the A2Π3/2u and 4Σ+u states. A method for accurate calibration of magnification factor of ion imaging system was presented. The improvement of energy resolution for large ionization volume experiments, like the crossed molecular beam and one-