Metastable excitation of sputtered silver atoms
- Fachbereich Physik, Universitaet Kaiserslautern, 67653 Kaiserslautern (Germany)
Neutral atoms sputtered from a polycrystalline silver surface under bombardment with 15 keV Ar{sup +} ions were investigated by resonant multiphoton ionization in combination with time-of-flight mass spectrometry. Electronically excited Ag atoms ejected in the metastable 4d{sup 9}5s{sup 2} {sup 2}D{sub 5/2} state (excitation energy 3.75 eV) were ionized by a frequency doubled tunable dye laser using a resonant single photon transition into the autoionizing 4d{sup 9}5s({sup 3}D)5p {sup 2}D{sub 5/2} state. Ground state silver atoms were detected by means of a resonant two photon ionization scheme involving the intermediate 4d{sup 10}({sup 1}S)5p {sup 2}P{sup 0} state. Both two and one color schemes were employed, the latter working via resonant excitation of Rydberg states and subsequent field ionization. The total population as well as the velocity distribution of sputtered metastable and ground state atoms were determined from the saturation behavior of the photoionization process and the flight time of the ejected neutral species between the ion bombarded surface and the ionization volume.
- OSTI ID:
- 21165662
- Journal Information:
- AIP Conference Proceedings, Vol. 388, Issue 1; Conference: 8. international symposium on resonance ionization spectroscopy, State College, PA (United States), 30 Jun - 5 Jul 1996; Other Information: DOI: 10.1063/1.52141; (c) 1997 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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