Joseph M. Jasinski

An infrared multiphoton dissociation study of radiative and collisional relaxation of vibrationally excited CF3O− ions

Infrared multiphoton dissociation is used in conjunction with pulsed ion cyclotron resonance spectroscopy to measure vibrational relaxation rates for CF3O− ions produced with excess vibrational energy via dissociative electron capture. Upper limits to the rate constants for both radiative and collisional vibrational relaxation are obtained. Collisional relaxation of the ions is found to be rather slow compared to the rates of many ion–molecule reactions.

Multiple decomposition pathways in infrared multiple-photon-induced reactions of ions

Abstract Multiple products have been observed for the first time in collisionless infrared multiphoton decompositions using an unfocused laser. The branching fractions provide evidence for barriers along the potential surfaces for fragmentation; possible origins of such barriers are discussed.

Saturation effects in the fluence dependence of the infrared photodissociation of CH3OHF

Abstract The fluence dependence of collisionless infrared multiphoton photodissociation of CH 3 OHF − has been studied. Saturation of the photodissociation yield with increasing fluence is observed. We find that the ion population consists of at least two components which photodissociate at different rates and infer that the quasi-continuum has some resonant absorption character.