Hong Lae Kim

Photodissociation of allyl cyanide at 193 nm

Abstract Photodissociation dynamics of allyl cyanide at 193 nm has been investigated by measuring laser-induced fluorescence spectra of CN fragments. From the spectra, rotational and vibrational energy distributions of CN have been obtained. The measured average rotational energy is 1080, 900 and 760 cm −1 for v″=0,1,2, respectively, and the fraction of the vibrational population is 0.70/0.24/0.06 for v″=0/1/2. The measured distributions are well represented by statistical prior calculations, from which the detailed dissociation dynamics is discussed.

Photodissociation of cyclopropyl cyanide at 193 nm

Photodissociation of cyclopropyl cyanide at 193 nm has been investigated by measuring laser induced fluorescence spectra of CN fragments that are exclusively produced in the ground electronic state. From the spectra, internal energy of CN and translational energy releases in the products were measured. Considering energetics for various product channels, it is concluded that cyclopropyl cyanide dissociates into an allyl and CN radicals resulting from ring opening prior to dissociation.

Efficient evaluation of second-order transition amplitudes by simultaneous propagation over intermediate and final states

Abstract A numerical scheme based on multichannel scattering theory is described to treat the second-order processes for which the intermediate and final states should be considered as multichannel scattering wave functions. Numerical computations are done to demonstrate the stability and efficiency of the method. Frequent q -reversals are observed in the second-order transition probabilities of a model system.