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Spectroscopic characterization of carbon radicals, ions, and cluster ions

English title Spectroscopic characterization of carbon radicals, ions, and cluster ions
Applicant Maier John Paul
Number 115864
Funding scheme Project funding
Research institution Physikalische Chemie Departement Chemie Universität Basel
Institution of higher education University of Basel - BS
Main discipline Physical Chemistry
Start/End 01.04.2007 - 31.03.2009
Approved amount 752'475.00
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Keywords (9)

carbon-clusters; radicals; electronic-spectra; ions; interstellar molecules; Electronic spectra; carbon chains; interstellar-chemistry; spectroscopic methods

Lay Summary (English)

Lead
Lay summary
The goal of the project is to measure the electronic spectra of chemically and astrophysically interesting radicals and ions. This provides both the fingerprint to identify the species in various environments by spectroscopy, e.g. laser based techniques on earth in flames, plasmas, or via star-light absorption in interstellar space, or planetary atmospheres. Methods used in the laboratory to obtain the spectra, range from direct absorption measurements on mass-selected species in neon matrices, to detection of fluorescence, to monitoring the absorption via cavity ring-down with lasers, to indirect means of following the transitions by multiphoton processes, and the use of ion-traps. The species are produced using laser vaporization and discharges within supersonic expansions and the sensitive laser techniques allow the small concentrations of the transients to be detected. The molecules studied are selected on the basis of their relevance in a particular environment: carbon chains, rings and fullerenes for astrophysical comparison; carbon and nitrogen containing radicals for planetary science, such as Titan, or in chemical reactions. The research involves in part the development and adaptation of laser methods for such spectroscopic characterizations.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Associated projects

Number Title Start Funding scheme
107386 Spectroscopic characterization of carbon radicals, ions, and cluster ions 01.04.2005 Project funding
124349 Spectroscopic Characterization of Carbon Radicals and Ions 01.04.2009 Project funding

Abstract

The goal of the project is to measure the electronic spectra of chemically and astrophysically interesting radicals and ions. This provides both the fingerprint to identify the species in various environments by spectroscopy, e.g. laser based techniques on earth in flames, plasmas, or via star-light absorption in interstellar space, or planetary atmospheres. Methods used in the laboratory to obtain the spectra, range from direct absorption measurements on mass-selected species in neon matrices, to detection of fluorescence, to monitoring the absorption via cavity ring-down with lasers, to indirect means of following the transitions by multiphoton processes, and the use of ion-traps. The species are produced using laser vaporization and discharges within supersonic expansions and the sensitive laser techniques allow the small concentrations of the transients to be detected. The molecules studied are selected on the basis of their relevance in a particular environment: carbon chains, rings and fullerenes for astrophysical comparison; carbon and nitrogen containing radicals for planetary science, such as Titan, or in chemical reactions. The research involves in part the development and adaptation of laser methods for such spectroscopic characterizations.
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