| Summary: | 碩士 === 國立臺灣大學 === 化學系 === 86 === The ionic and luminous products of allene excited with a
single focused laser
beam at 193 nm are detected by a time-of-flight mass spectrometer and a
dispersed emission spectrometer, respectively. The major ionic
products detected
are C3+, C2+, and C+. For the emission spectra, the C2 Swan system, C2 Mulliken
system, CH transitions, and an atomic line corresponding to the
C transition are
the major features. The vibrational population distribution of the C2(d3Pg)
state is found to be inverted with respect to thermal
distributions. Laser power
dependence of each product is measured and a kinetic model is developed to
investigate the ionization and dissociation mechanisms. The experimental data
infer that phtodissociation of C3Hn (n = 1-4) at 193 nm is more favored than
multiphoton ionization within the laser flux used (< 2.7E26 photons cm-2 s-1).
While for the C3, multiphoton ionization and multiphoton dissociation are both
feasible.
|
|---|
