Anisotropy Measurements from the Near-Threshold Photodissociation of the N-NO Complex.

We have used velocity map ion imaging to measure the angular anisotropy of the NO (A) products from the photodissociation of the N-NO complex. Our experiment ranged from 108 to 758 cm above the threshold energy to form NO (A) + N (X) products, and these measurements reveal, for the first time, a strong angular anisotropy from photodissociation. At 108 cm above the photodissociation threshold, we observed NO (A) photoproducts recoil preferentially perpendicular to the laser polarization axis with an average anisotropy parameter, β = -0.

Singlet O Produced by Ultraviolet Dissociation of the β-ionone-O Complex.

We formed the gas-phase β-ionone-O complex in a supersonic expansion and then photodissociated the complex with light near 312 nm. Photodissociation resulted in the production of O in the a Δ state, which was ionized at 312 nm using (2 + 1) resonance-enhanced multiphoton ionization (REMPI). We recorded the O REMPI action spectrum and O velocity map ion image following photodissociation of the complex.