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Collision-induced dissociation of formaldehyde cations: The effects of vibrational mode, collision energy, and impact parameter
 

Summary: Collision-induced dissociation of formaldehyde cations: The effects
of vibrational mode, collision energy, and impact parameter
Jianbo Liu, Brian Van Devener, and Scott L. Anderson
Department of Chemistry, University of Utah, Salt Lake City, Utah 84112
Received 30 November 2001; accepted 15 January 2002
We report a study of collision-induced dissociation CID of H2CO , including measurement of the
effects of collision energy (Ecol) and five different H2CO vibrational modes on the CID integral
and differential cross sections. CID was studied for collision with both Xe and Ne, and the Ne
results provide a very detailed probe of energy transfer collisions leading to CID. The CID
appearance threshold is found to depend only on total energy, but for all energies above threshold,
vibrational energy is far more effective at driving CID than Ecol , with some mode-specificity.
Results are fit with an impact parameter-based mechanism, and considerable insight is obtained into
the origins of the Ecol and vibrational effects. A series of ab initio and RRKM calculations were also
performed to help interpret the results. 2002 American Institute of Physics.
DOI: 10.1063/1.1457438
I. INTRODUCTION
Collision-induced dissociation CID is an important
method used to probe ion structure14
and bond energies.59
CID is typically done by colliding the molecular ion of in-

  

Source: Anderson, Scott L. - Department of Chemistry, University of Utah

 

Collections: Energy Storage, Conversion and Utilization; Materials Science; Chemistry