Dynamics of single and multiphoton ionization processes in molecules

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5338151

Lynch, D L

Single-photon and resonant multiphoton ionization studies, which can now be carried out using synchrotron radiation and lasers, respectively, are providing important dynamical information on molecular photoionization. The author studied the underlying dynamical features of these ionization processes using Hartree-Fock continuum orbitals generated using the iterative Schwinger variational method for solving the photoelecttron collisional equations. The single-photon studies examine the important role that shape and autoionizing resonances play in molecular photoionization, while the multiphoton studies investigate the ionization dynamics of exited electronic states. The subtle nature of shape resonances was demonstrated in polyatomic systems such as C/sub 2/H/sub 2/ and C/sub 2/N/sub 2/, where the possibility of multiple resonances in a single channel is observed. Molecular autoionizing resonances are known to dominate regions of the photoionization spectra. The author adapted and applied a generalization of the Fano treatment for autoionization to molecular systems. Results for H/sub 2/ and C/sub 2/H/sub 2/ autoionizing resonances are presented and discussed.

• Research Organization: California Inst. of Tech., Pasadena (USA)
• OSTI ID: 5338151
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ACETYLENE
ALKYNES
COLLISIONS
DYNAMICS
ELEMENTS
ENERGY LEVELS
EXCITED STATES
HARTREE-FOCK METHOD
HYDROCARBONS
HYDROGEN
IONIZATION
MECHANICS
MOLECULES
NONMETALS
ORGANIC COMPOUNDS
PHOTOIONIZATION
PHOTON COLLISIONS
RESONANCE
SCHWINGER VARIATIONAL METHOD
VARIATIONAL METHODS