This thesis concerns the study of fragmentation dynamics of highly
charged triatomic and polyatomic molecular ions created by high
energy electron impact on neutrals. A momentum spectrometer was
designed and assembled to carry out the study. An event-by-event
reconstruction of the momentum space spanned by the fragments
helped us to study various aspects of dissociation, such as
identification of channels, lifetime of metastables, kinetic energy
release, angular distribution of fragments and preferential bond
breaking. Some deductions are supported by quantum chemical
computations. The symmetry of a molecular ion is often different
from that of the ground state of the neutral. For a linear
triatomic, CO_2, we deduced that geometry of the dication is
different from that of the neutral. For polyatomics such as CCl_4
and SF_6, the change is very substantial and involves migration of
atoms. In addition, we have identified certain stability patterns
in the fragments. The stability depends on the possibility of
forming filled hybrid molecular orbitals, which in turn is related
to even/odd electron numbers in the fragment ions.
General
Imprint: |
Lap Lambert Academic Publishing
|
Country of origin: |
Germany |
Release date: |
2012 |
First published: |
2012 |
Authors: |
Vandana Sharma
|
Dimensions: |
229 x 152 x 8mm (L x W x T) |
Format: |
Paperback - Trade
|
Pages: |
128 |
ISBN-13: |
978-3-8473-7188-5 |
Categories: |
Books >
Science & Mathematics >
Physics >
General
|
LSN: |
3-8473-7188-6 |
Barcode: |
9783847371885 |
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