The influence of neutral reagents on the effective recombination energy of the ArN+2 cluster ion in charge-transfer reactions at thermal energies

Tsuji, Masaharu; Matsumura, Ken-ichi; Aizawa, Masato; Funatsu, Tsuyoshi; Nishimura, Yukio
March 1995
Journal of Chemical Physics;3/22/1995, Vol. 102 Issue 12, p4842
Academic Journal
In order to examine the influence of neutral reagents on the effective recombination energy of a simple cluster ion in charge-transfer (CT) reactions at thermal energy, CT reactions of ArN+2 with CH3Cl, CH2Cl2, CO2, and Kr are studied at near-thermal energy by using an ion-beam apparatus. Only CT channels leading to parent ion and/or fragment ions are found for all reagents. The reaction rate constants are (0.72–1.4)×10-9 cm3 s-1, which correspond to 55%–230% of the calculated values from Langevin or averaged dipole oriented theory. The effective recombination energy of ArN+2 in the CT reactions is found to depend on the ionization potentials of reagents. For CH3Cl and CH2Cl2 with lower ionization potentials of 11.27 and 11.35 eV than the effective recombination energy of ArN+2(∼13.5 eV), respectively, CT reactions occur without distortion of ArN+2. On the other hand, for CO2 and Kr with slightly higher ionization potentials of 13.78 and 14.00 eV than that, respectively, the bond length of (Ar–N2)+ slightly expands due to interactions with the reagent to increase the effective recombination energy of ArN+2 and to induce CT reaction. © 1995 American Institute of Physics.


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