The radiative-decay rates of the 2s 2p( P')-2s2p ( P) intersystem transitions of C+ ions have been measured by recording the time dependence of the 233-nm emission. A cylindrical radiofrequency ion trap was used to store electron-impact-produced C ions. The time-dependent signals were analyzed by multiexponential least-squares fits to the data. The measured radiative-decay rates to the ground term are 146.4(+8.3, -9.2) s for Pi~q, 11. 6(+0.8, -1.7) s for Psych, and 51.2(+2.6, -3. 5) s for Psyq Com. parison of the measured values with theoretical values is presented.
A new method is described that combines the production of ions by laser ablation with a reflection time-of-flight mass spectrometer for charge-transfer cross section measurements. This method allows a specific charge-transfer channel of an ion-neutral pair to be measured at energies of about 0.1 keV/amu. The metastable state ion fraction in the laser ablation ion beam is shown to be negligible. The charge-transfer cross section is determined by measuring the intensity ratio of the product ions to the parent ions after the charge-transfer reactions occur in the reflection drift tube. Verification on the apparatus is demonstrated through investigation of a single electron charge transfer of ground state C 2ϩ ions and H 2 with the incident energy of C 2ϩ at 3045.6͑ϭ12.4͒ eV. Our measured cross section of 6.90(Ϯ0.78)ϫ10 Ϫ16 cm Ϫ2 is consistent with ground state measurements reported previously. Because of the versatility of the pulsed laser ablation ion source, this facility can be used to examine the cross sections of a variety of multiply charged ions from refractory or gaseous elements.
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