Femtosecond multiphoton ionization of ammonia clusters
| Autor: | J. Purnell, S. A. Buzza, A. W. Castleman, Robert J. Stanley, S. Wei |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Chemistry
Analytical chemistry General Physics and Astronomy Photoionization Photochemistry Dissociation (chemistry) Ion Ionization Femtosecond Physics::Atomic and Molecular Clusters Mass spectrum Cluster (physics) Physical and Theoretical Chemistry Astrophysics::Galaxy Astrophysics Electron ionization |
| Zdroj: | The Journal of Chemical Physics. 97:9480-9482 |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.463273 |
| Popis: | Herein, we report on femtosecond time‐resolved experiments in ammonia clusters. The mechanisms of their ionization and the subsequent formation of the protonated ammonia cluster ions are studied using a femtosecond pump‐probe technique at 620 nm. It is found that an intermediate corresponding to C’ states of the monomer is responsible for the ionization of ammonia clusters. Femtosecond pump–probe studies show that the lifetime of the intermediate to the formation of the protonated cluster ions (NH3)nH+ (n=1–5) is the same as that leading to the formation of the unprotonated cluster ions (NH3)m+ (m=2–5). The results provide the first direct experimental proof that formation of the protonated cluster ions takes place through an absorption–ionization–dissociation mechanism. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|