Molecules, velocity mapping

Velocity Mapping of UV Multiphoton Excited Molecules (Chandler and... 

VELOCITY MAPPING OF MULTI PHOTON EXCITED MOLECULES... 

The veloeity and angular distributions of NO produced by UV photolysis of nitrosobenzene have been determined by velocity-map ion imaging. With light of A = 290.5 (S2 state) and 226 nm (5n (n > 3) states), completely isotropic velocity distributions were observed, leading to the conclusion that photodissodation occurs on a timescale much slower than rotation of the parent molecule, and after redistribution of the excess energy into the vibrational modes. 

Photochemistry of gas-phase molecules, including species of atmospheric importance the molecular photodissociation dynamics are traced by photofragment ion (velocity map) imaging. 

Arthur Suits is a professor of chemistry at Wayne State University where he and his group study the many roles office radicals—atoms or molecules with unpaired electrons—in chemical processes. One of the techniques developed in his lab, DC Shce Velocity Map Imaging, uses a video camera to record images of ions formed by photo ionization after (for one example) a dissociation reaction occurs. For instance, Suits has used laser photodissociation (Section 7.4) to break deuterium bromide ( HBr or DBr) into deuterium and bromine radicals. The photodissociation occurs at a fixed photon energy... 

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