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Accession Number:
ADA278913
Title:
A Two-Dimensional Model for Collisional Energy Transfer in Bimolecular Ion-Molecule Dynamics
Corporate Author:
UTAH UNIV SALT LAKE CITY DEPT OF CHEMISTRY
Report Date:
1994-04-22
Abstract:
Guided ion beam kinetic energy thresholds in the ion-molecule reactions MH2 yields MHH where M is a closed-shell atomic ion B, Al, or Ga, were found to exceed by 0.4 to c.a. 5 ev the thermodynamic energy requirements or the theoretically computed barrier heights for these reactions. In addition, the formation of MD occurs at a significantly lower threshold than MH when M reacts with HD. Moreover, the measured reaction cross-sections for the production of MH or MD product ions are very small 10exp -17 to 10 exp -20sq cm being largest for B and smallest for Ga . A previous paper from this group proposed that collisional-to-internal energy transfer is the rate-limiting step for this class of reactions. It also suggested, based on a dynamical resonance picture, that collisions occurring at or near C2v symmetry are more effective than other collisions even though C2v geometries provide no lower potential energy barriers than others.
Descriptive Note:
Technical rept.
Pages:
0072
Distribution Statement:
Approved for public release; distribution is unlimited.
Contract Number:
N00014-89-J-1497
File Size:
1.68MB
