q and Z Dependence of Two-electron Processes in Lo

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q and Z Dependence of Two-electron Processes in Low Energy Ion Collisions

. Thescatteredionsarechargedstate. analyzedbyusingaparallelplatefieldandthendetectedbyapositionsensitivechannelplate. TherecoilionsareextractedfromtheinteractingzonebYastaricfieldandthendetectedbyachannelelectronmultiplier. Amulti-parameteracquisitionsystemisusedtomeasurethecoincidentspectrumofthescatteredandrecoilions. TherecoilionproductionratioofHe2 + / Hel + in1.86keV/uXeq +. Hefq = 15 ~ 21) collisionsisshowninFig. 1. Forthecollisionsystemstudied. He2 + / He1 + ratioincreasesasqincreases. Itmeansthattheprojectilewithhigherchargestatemayhavehighermulti-captureandtransferionizationprobability,[link widoczny dla zalogowanych], anditisinagreementwiththecalculationoftheover. barriermode1. Thetransferionizationtosinglecaptureratioo-T/cr0cforq = 4projectile (z = 6 ~ 10) andneonc0lli8ionsisshowninFig. 2. Theratio'dqissettobela. u. fortheprojectilesinvolvedinthiswork. Fig. 2showsthattheT/scratiodecreasesasincreases. ItsuggeststhattherecoilNet + ionsmayhavehigherauto-ionizationprobabilityincaseoflightion. Ne. collisions,[link widoczny dla zalogowanych], andtherewillbeahigherenergYdepositionintherecoilNe1 + ionsafterthecaptureofoneelectronfromNetotheprojectile. andthustherecoilNe1 + ionswillhaverelativelylargeprobabilitytoionizeanotherelectron. Rererences0.30 soil 0.25 ∞ 0.20 ∞ Tian Tian 0.150.10 mouth Fig. 1He2 + / He. + Ratiofor1.86keV/uXeqd-. Hecollisions. 【1】 A. Niehaus, J. Phys. , B19 (1986) 2925. 【2] x. Cai, eta1. , J. Eur. Phys. ,[link widoczny dla zalogowanych], D6 (1999) 23. Ulb,[link widoczny dla zalogowanych], head b6789lOZFig. 2TheZdependenceofthedoublecapturetosinglecaptureration. SupportedbytheKeyProjectoftheNationalNaturalScienceFoundationofChina. DepartmentofModernPhysics, Lan ~ houUniversity, Lanzhou,[link widoczny dla zalogowanych], China.