Femtosecond multiphoton ionization of ammonia clusters
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802 (United States)
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 [ital C][prime] 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 (NH[sub 3])[sub [ital n]]H[sup +] ([ital n]=1--5) is the same as that leading to the formation of the unprotonated cluster ions (NH[sub 3])[sub [ital m]][sup +] ([ital 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.
- DOE Contract Number:
- FG02-88ER60648
- OSTI ID:
- 7016701
- Journal Information:
- Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 97:12; ISSN JCPSA6; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400500* -- Photochemistry
ABSORPTION
AMMONIA
CATIONS
CHARGED PARTICLES
COMPLEXES
DISSOCIATION
ELECTROMAGNETIC RADIATION
HYDRIDES
HYDROGEN COMPLEXES
HYDROGEN COMPOUNDS
ION PAIRS
IONIZATION
IONS
MOLECULAR CLUSTERS
MOLECULAR IONS
MONOMERS
MULTI-PHOTON PROCESSES
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
OPTICAL PUMPING
PHOTOIONIZATION
PUMPING
RADIATIONS
RESOLUTION
SORPTION
TIME RESOLUTION
TIMING PROPERTIES
VISIBLE RADIATION