| Autor: |
Baopeng Cao, Starace, Anne K., Judd, Oscar H., Bhattacharyya, Indrani, Jarrold, Martin F. |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 11/28/2014, Vol. 141 Issue 20, p1-6, 6p, 2 Graphs |
| Abstrakt: |
Kinetic energy thresholds have been measured for the chemisorption of N2 onto Al114+, Al115+, and Al117+ as a function of the cluster's initial temperature, from around 200 K up to around 900 K. For all three clusters there is a sharp drop in the kinetic energy threshold of 0.5-0.6 eV at around 450 K, that is correlated with the structural transition identified in heat capacity measurements. The decrease in the thresholds corresponds to an increase in the reaction rate constant, k(T) at 450 K, of around 106-fold. No significant change in the thresholds occurs when the clusters melt at around 600 K. This contrasts with behavior previously reported for smaller clusters where a substantial drop in the kinetic energy thresholds is correlated with the melting transition. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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