Multiphoton ionization spectroscopy and photochemistry of transient species: Progress report, July 15, 1986--January 15, 1989
The work funded by the Department of Energy is primarily concerned with the resonance ionization spectroscopy of small molecules and radicals. During this grant period we have examined the electronic spectra of several diatomic and triatomic molecules with a view toward the better understanding of their electronic structure and photochemistry, as well as the development of the tool of resonance ionization spectroscopy for such practical applications as the detection of trace species. We have also done some work on the photophysics of the multiphoton ionization process, using argon as the test system. The molecules chosen for study all have the common property that they do not fluoresce from states in the selected energy region, and their absorption spectra for these states is either forbidden or greatly obscured by the continuous absorption of dissociating states. Resonance ionization spectroscopy is valuable in that it can probe the absorptions of high lying states and that it discriminates against rapidly dissociating states, allowing the weaker but more stable states to make themselves known. The molecules for which substantial results have been obtained during this grant period are metastable nitrogen, iodine, carbon monochloride, and carbon dioxide. The first and last of these are not chemically stable and are formed by an electric discharge in a supersonic beam, while the other two, although chemically stable in the ground state, dissociate easily in the excited state and pose a challenge for spectroscopy because of their diffuse spectra.
- Research Organization:
- State Univ. of New York, Stony Brook (USA)
- DOE Contract Number:
- FG02-86ER13590
- OSTI ID:
- 6790762
- Report Number(s):
- DOE/ER/13590-3; ON: DE89006248
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
74 ATOMIC AND MOLECULAR PHYSICS
ARGON
PHOTOIONIZATION
CARBON DIOXIDE
IODINE
NITROGEN
PHOTOCHEMISTRY
MULTI-PHOTON PROCESSES
ELECTRONIC STRUCTURE
ENERGY LEVELS
METASTABLE STATES
PROGRESS REPORT
RYDBERG STATES
SPECTROSCOPY
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMISTRY
DOCUMENT TYPES
ELEMENTS
EXCITED STATES
FLUIDS
GASES
HALOGENS
IONIZATION
NONMETALS
OXIDES
OXYGEN COMPOUNDS
RARE GASES
400500* - Photochemistry
640302 - Atomic
Molecular & Chemical Physics- Atomic & Molecular Properties & Theory