Dissociative electron attachment resonances in ammonia: a velocity slice imaging based study

The Journal of Chemical Physics
N Bhargava Ram, E Krishnakumar

Abstract

Negative ion resonance states of ammonia are accessed upon capture of electrons with energy 5.5 eV and 10.5 eV, respectively. These resonance states dissociate to produce H(-) and NH(2)(-) fragment anions via different fragmentation channels. Using the velocity slice imaging technique, we measured the angular and kinetic energy distribution of the fragment H(-) and NH(2)(-) anions with full 0-2π angular coverage across the two resonances. The scattered H(-) ions at both resonances show variation in their angular distribution as a function of the kinetic energy indicating geometric rearrangement of NH(3)(-*) ion due to internal excitations and differ from the equilibrium geometry of the neutral molecule. The second resonance at 10.5 eV shows strong forward-backward asymmetry in the scattering of H(-) and NH(2)(-) fragment ions. Based on the angular distributions of the H(-) ions, the symmetry of the resonances at 5.5 eV and 10 .5 eV are determined to be A(1) and E, respectively, within C(3v) geometry.

References

Jun 1, 1991·Physical Review. a·K R LykkeW C Lineberger
Mar 29, 2002·Nature·Max P BernsteinLouis J Allamandola
Feb 11, 2005·Angewandte Chemie·Sylwia PtasińskaEugen Illenberger
Oct 26, 2005·Physical Review Letters·Vaibhav S PrabhudesaiE Krishnakumar

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Citations

Mar 28, 2013·The Journal of Physical Chemistry. a·Hong-Kai LiShan Xi Tian
Sep 26, 2019·Physical Chemistry Chemical Physics : PCCP·Dipayan ChakrabortyDhananjay Nandi
Aug 19, 2015·The Journal of Physical Chemistry Letters·Y KawaraiD S Slaughter

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