Abstract
The vibrational (and rotational) energy distribution of ions produced in the He+/N2O charge transfer reaction at thermal energy has been measured by laser induced fluorescence using an Ion Cyclotron Resonance cell to store the ions. Vibrational levels up to V" = 5 have been observed.The relaxation processes experienced by the (X) ions before laser detection are discussed.
Highlights
Laser Induced Fluorescence is a vej powerful method to investigate the internal energy of reaction products and get
To observe the nascent internal states of ion molecule reaction products one has to find experimental conditions where reaction is much faster than relaxation
Relaxation is further reduced in the beam experiment where the ions undergo a supersonic expansion into the interaction region where they cross a pulsed supersonic let of reactant gas
Summary
To observe the nascent internal states of ion molecule reaction products one has to find experimental conditions where reaction is much faster than relaxation. Two types of such experiments have been reported in the literature flowing afterglow -3 and more recently a single collision molecular beam device[3,4,5,6]. Relaxation is further reduced in the beam experiment where the ions undergo a supersonic expansion into the interaction region where they cross a pulsed supersonic let of reactant gas This allows the investigation of reactions such as. CO+(X,v"=O) could be observed because, in the pressure conditions imposed by the detection sensitivity, relaxation was much faster than reaction Further improvement in the detection sensitivity, insufficient to study slow reactions, made possible the observation of nascent products of fast ion molecule reactions
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