Photodissociation dynamics of the HCNN radical

The photodissociation dynamics of the diazomethyl (HCNN) radical have been studied using fast radical beam photofragment translational spectroscopy. A photofragment yield spectrum was obtained for the range of 25 510-40 820 cm-1, and photodissociation was shown to occur for energies above 25 600 cm-1. The only product channel observed was the formation of CH and N2. Fragment translational energy and angular distributions were obtained at several energies in the range covered by the photofragment yield spectrum. The fragment translational energy distributions showed at least two distinct features at energies up to 4.59 eV, and were not well fit by phase space theory at any of the excitation energies studied. A revised C-N bond dissociation energy and heat of formation for HCNN, D0 (HC-NN) =1.139±0.019 eV and Δf H0 (HCNN) =5.010±0.023 eV, were determined. © 2006 American Institute of Physics.Ann Elise Faulhaber, Jason R. Gascooke, Alexandra A. Hoops, and Daniel M. Neumar

Photodissociation spectroscopy and dynamics of the CH(2)CFO radical

Alexandra A. Hoops, Jason R. Gascooke, Kathryn E. Kautzman, Ann Elise Faulhaber, and Daniel M. Neumar

Fast beam studies of I(2)(-) and I(2)(-) (.) Ar photodissociation

Copyright © 2003 Elsevier Science B.VThe photodissociation dynamics of bare I₂⁻ and I₂⁻ • Ar at 413 and 390 nm have been investigated using a fast beam instrument coupled with a new photofragment coincidence imaging detector. Results from the application of this technique to the dissociation of I₂⁻ and I₂⁻ • Ar yielded the dissociation energy of I₂⁻ (D₀(I₂⁻)=1.012±0.008 eV) and I₂⁻–Ar binding energy (D0(I₂⁻–Ar)=45±8 meV). The experiments show that at these wavelengths, I₂⁻ • Ar undergoes three-body dissociation to I⁻ + I* + Ar, with very low momentum in the Ar atom and unequal momentum partitioning between the two I atoms.Alexandra A. Hoops, Jason R. Gascooke, Ann Elise Faulhaber, Kathryn E. Kautzman and Daniel M. Neumar