Beta: High resolution slice velocity map imaging
Beta is a DC slice imaging machine built in 2003 by David Townsend and Mike Minitti  Numerous state-selected photodissociation experiments have been performed on Beta, including the formaldehyde investigation that revealed the roaming mechanism  More recent experiments have utilized IRMPD to study near threshold ground state dissociation dynamics of nitroalkanes, alkyl nitrites, and chlorinated hydrocarbons [3-5] Furthermore, complementary UV photodissociation and IRMPD investigations, with the help of multireference ab initio calculations, characterized the dissociation dynamics of propargyl chloride [6,7]
In 2020, Beta has returned to its roots with experiments aiming to demonstrate and explain quantum aspects of roaming dynamics in formaldehyde. The current Beta team is led bygraduate student Casey D. Foley and experiments are funded by Army Research Office grant W911NF-17-1-0099.
Foley, C. D.; Alavi, S. T.; Joalland, B.; Broderick, B. M.; Dias, N.; Suits, A. G. Imaging the Infrared Multiphoton Excitation and Dissociation of Propargyl Chloride. Phys. Chem. Chem. Phys. 2019, 21, 1528-1535.
Foley, C. D.; Joalland, B. S.; Alavi, S. T.; Suits, A. G. Mixed Transitions in the Uv Photodissociation of Propargyl Chloride Revealed by Slice Imaging and Multireference Ab Initio Calculations. Phys. Chem. Chem. Phys. 2018, 20, 27474-27481
Townsend, D.; Minitti, M. P.; Suits, A. G. Direct Current Slice Imaging. Rev. Sci. Instrum. 2003, 74, 2530-2539.
Townsend, D.; Lahankar, S.; Lee, S.; Chambreau, S.; Suits, A.; Zhang, X.; Rheinecker, J.; Harding, L.; Bowman, J. The Roaming Atom: Straying from the Reaction Path in Formaldehyde Decomposition. Science 2004, 306, 1158-1161.