title: Mode specific photodissociation of CS2(+) via the A2Π(u) state: a time-sliced velocity map imaging study.
abstract: The vibrationally mediated photodissociation of CS(2)(+) cations via the A(2)Π(u)(ν(1),ν(2),0) state has been studied by means of the velocity map ion imaging technique. The measurements were made with a double resonance strategy. The CS(2)(+) cations were prepared by a (3 + 1) resonance enhanced multiphoton ionization method. The photo-fragment excitation spectrum of S(+) was recorded by scanning the photolysis laser via the A(2)Π(u)(ν(1),ν(2),0) state. By fixing the photolysis laser wavelength at the specific vibrational state, the (1 + 1) photodissociation images of S(+) photofragments from numerous vibrationally mediated states have been accumulated. The translational energy release spectra derived from the resulting images imply that the co-fragments, CS radicals, are both vibrationally and rotationally excited. The one-photon photodissociation without the vibrational state selection has also been performed. Comparing the vibrationally mediated photodissociation with one-photon photodissociation observations, clear evidence of vibrational state control of the photodissociation process is observed.
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.
authors.forename: Cuimei
authors.initials: C
authors.lastname: Zhang
authors.forename: Jialin
authors.initials: J
authors.lastname: Li
authors.forename: Qun
authors.initials: Q
authors.lastname: Zhang
authors.forename: Yang
authors.initials: Y
authors.lastname: Chen
authors.forename: Cunshun
authors.initials: C
authors.lastname: Huang
authors.forename: Xueming
authors.initials: X
authors.lastname: Yang