Collisionhyphen;induced dissociation of 0.4ndash;2.6 keVH2plus;andD2plus;

摘要

The energy distributions for protons (deuterons) from the collisionhyphen;induced dissociation ofH2plus;thinsp;lpar;D2plus;rpar;ions incident upon inert gas atom targets at energies in the range 0.4ndash;2.6 keV have been measured. By modeling the ion source plasma an estimate of the vibrational distribution function of the primary beam has been obtained and used in a generalized spectrometer efficiency function to transform the spectra into the centerhyphen;ofhyphen;momentum frame of the ions. The resulting distributions are interpreted in terms of two main dissociation mechanisms: electronic excitation and polarizationhyphen;induced vibrationalhyphen;rotational excitation. Fine structure appearing in some spectra is attributed to rotational predissociation of a projectilehyphen;target complex.