Study of State-selective Cross Sections in Ion-atom Collisions by Reaction Window Theory

The measurement of energy gain spectra of projectile is an effective method to study state-selective cross sections in ion-atom collisions in recent decades.For pure electron capture process, we can get the energy gain of the reaction:Q= -v0Pz-(nv02)/2 (a. u.) , by measuring the recoil-ion longitudinal momentum Pz, where -v0 is the velocity of the projectile, and n is the number of captured electrons. Theoretically, using the extended MCBM(Molecular Coulombic over Barrier Model) , i. e. reaction window theory, one can get a Gaussian distrubution of the differential cross section in a certain electron capture process about the Q value. That

The measurement of energy gain spectra of projectile is an effective method to study state-selective cross sections in ion-atom collisions in recent decades.For pure electron capture process, we can get the energy gain of the reaction：Q= -v0Pz-（nv02）/2 （a. u.） , by measuring the recoil-ion longitudinal momentum Pz, where -v0 is the velocity of the projectile, and n is the number of captured electrons. Theoretically, using the extended MCBM（Molecular Coulombic over Barrier Model） , i. e. reaction window theory, one can get a Gaussian distrubution of the differential cross section in a certain electron capture process about the Q value.