Formation of negatively-charged cluster ions in thermal energy collisions with state-selected rydberg atoms |
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Authors: | T Kraft M -W Ruf H Hotop |
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Institution: | 1. Fachbereich Physik der Universit?t, D-6750, Kaiserslautern, Federal Republic of Germany
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Abstract: | Using crossed atomic, molecular cluster, and cw laser beams in conjunction with mass spectrometric ion detection, we have obtained for the first time results for electron transfer fromstate-selected Rydberg atoms to molecular clusters. We report negative ion mass spectra for (CO2) k ? (4≦k≦25) and (O2) k ? (1≦k≦13) cluster ions, resulting from collisions of Ar** (nd) Rydberg atoms (12≦n≦40) with (CO2) m and (O2) m clusters at relative velocities around 830 m/s, and, for comparison, positive ion mass spectra due to Ne(3s 3 P 2, 0) Penning ionization. For both CO 2 ? and O2-clusters, the negative and the positive ion mass spectra are very different. For (CO2) k Emphasis>/? cluster ions, the mass spectra show distinct variations with principal quantum number of the Rydberg atom, corresponding to differentn-dependences of the effective rate constant for selected cluster ions, as measured relative to the knownn-dependence for SF 6 ? formation in collisions with SF6. For (O2) k ? cluster ions, on the other hand, the mass spectra are almost independent ofn with ion intensities, which clearly reflect their thermochemical stabilities (O 4 ? as dominant species). |
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