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 National Science
Foundation Award #9122333 |
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Kinetics of Gas-Phase Ion Association and Dissociation |
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| Investigator(s): |
Robert Dunbar (PI)
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| Sponsor: |
Case Western Reserve University, OH 44106 2163684510
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| Start Date/Expiration Date |
1992-03-15 to 1995-02-28 (amended 1994-02-28) |
| Awarded Amount to Date: |
$368,000 |
| Abstract: In this project in the Experimental Physical Chemistry Program of the Chemistry Division, Robert Dunbar of Case Western Reserve University will study the properties of gas-phase ions interacting with laser light using an ion cyclotron resonance ion trap. "Medium-to-large" hydrocarbons, organometallic compounds, clusters, and complex ions are targets for study. Time-resolved photodissociation kinetics, measurement of radiative cooling rates of excited ions, infrared multiphoton dissociation kinetics, the determination of radiative association efficiencies and of partitioning of vibrational energy in the products of complex ion dissociation will all be examined. The temperature dependence of some of these processes will be determined using an ion trap cooled to 77 K. Theoretical studies will be conducted dealing with infrared multiphoton dissociation and radiative association in conjunction with an expert versed in statistical mechanics. %%% The development of the technique known as Ion Cyclotron Resonance Spectroscopy has enabled scientists to trap electrically charged atoms or molecules, known as ions, for relatively long times, on the order of seconds or longer. With such long storage times, various processes involving ions which last up to seconds in time can now be studied more easily. Examples of such processes include the breakup of an ion after the absorption of light with just enough energy to sever the bonds between atoms (near-threshold photodissociation) and the emission of infrared radiation. Professor Dunbar's work will allow him to study several of these "slow" chemical processes for a variety of fairly large molecular ions. |
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| NSF Org: |
CHE - Division of Chemistry |
| Award Number: |
9122333 |
| Award Instrument: |
Continuing grant |
| Program Manager: |
Joan M. Frye
CHE Division of Chemistry
MPS Directorate for Mathematical & Physical Sciences
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| NSF Program(s): |
SPECTROSCOPY |
| Field Application(s): |
Chemistry, Other nsf.applications NEC |
| Program Reference Code(s): |
AIR QUALITY, 9188
ENVIRONMENT, ENVI
ENVIRONMENTAL CHEMISTRY, 9156
GLOBAL CHANGE, GLCH
GLOBAL TROPOSPHERIC CHEMISTRY, 1309
UNASSIGNED, 0000 |
| Program Element Code(s): |
1962 |
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