Highly excited Rydberg states of pyrazine and their autoionization
The two-color MPI spectra of jet-cooled pyrazine obtained via various vibrational levels in the S/sub 1/(n,..pi..*) state have been observed. A regularity was found in that the Rydberg series lying above the adiabatic ionization potential appear upon excitation of the S/sub 1/ vibronic level containing the nontotally symmetric vibration but they are apparently absent upon excitation of the S/sub 1/ vibronic level containing the totally symmetric vibration. The regularity is similar to that found by Hager et al. for aniline and can be explained as due to the interaction between a discrete level and an isoenergetic ionization continuum. The appearance or apparent absence of the Rydberg series results from the absorption cross section of the interacting ionization continuum in the transition from the S/sub 1/ vibronic level. The electronic structures of the Rydberg state and ion and the vibrational potentials of the ion are discussed.
- Research Organization:
- Tohoku Univ., Sendai, Japan
- OSTI ID:
- 6542593
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 91:9
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
PYRAZINES
AUTOIONIZATION
RYDBERG STATES
ELECTRONIC STRUCTURE
EXPERIMENTAL DATA
JETS
MULTI-PHOTON PROCESSES
NOZZLES
VIBRATIONAL STATES
AZINES
DATA
ENERGY LEVELS
EXCITED STATES
HETEROCYCLIC COMPOUNDS
INFORMATION
IONIZATION
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
400201* - Chemical & Physicochemical Properties