A comparison of the charge transfer and collisional activation processes in collisions between keV He+ and CO2
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| Title: | A comparison of the charge transfer and collisional activation processes in collisions between keV He+ and CO |
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| Authors: | Lin, Yawei1, Mayer, Paul M. pmmayer@uottawa.ca |
| Source: | Chemical Physics. Dec2010, Vol. 378 Issue 1-3, p103-109. 7p. |
| Subjects: | Comparative studies, Charge transfer, Collisions (Nuclear physics), Activation (Chemistry), Carbon dioxide, Helium ions, Mass spectrometers, Potential energy surfaces, Energy levels (Quantum mechanics) |
| Abstract: | Abstract: A commercial mass spectrometer coupled with a spectrograph and charge-coupled device (CCD) was used to obtain the collision-induced emission (CIE) spectra (190–1020nm) from 4 to 8keV collisions between projectile He+ ions and CO2 target gas (He+ /CO2). The observed emissions were from the and states of , excited states of He, along with excited fragments. The relative vibrational population of the state were estimated and compared with our previous /He studies. The results indicate that charge transfer ionization of CO2 in He+ /CO2 collisions is similar to that of photoexcitation, while in the case of /He, the population is more evenly distributed due to intramolecular vibrational redistribution (IVR) after the collision. Adiabatic potential energy surfaces calculated at the CISD/6-311+g(2df) level of theory for /He collisions, show the curve crossing of the and states, in agreement with our observation. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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