Fluorescence excitation involving multiple electron transition states of N{sub 2} and CO{sub 2}

Technical Report · Tue Apr 01 04:00:00 EST 1997

DOI:https://doi.org/10.2172/603604· OSTI ID:603604

Wu, C. Y.R.; Chen, F. Z.; Hung, T.; Judge, D. L. ^[1]

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1. Univ. of Southern California, Los Angeles, CA (United States)

The electronic states and electronic structures of N{sub 2} and CO{sub 2} in the 8-50 eV energy region have been studied extensively both experimentally and theoretically. In the energy region higher than 25 eV there exists many electronic states including multiple electron transition (MET) states which are responsible for producing most of the dissociative photoionization products. The electronic states at energies higher than 50 eV have been mainly determined by Auger spectroscopy, double charge transfer, photofragment spectroscopy and ion-ion coincidence spectroscopy. The absorption and ionization spectra of these molecules at energies higher than 50 eV mainly show a monotonic decrease in cross section values and exhibit structureless features. The decay channels of MET and Rydberg (or superexcited) states include autoionization, ionization, dissociative ionization, predissociation, and dissociation while those of single ion and multiple ion states may involve predissociation. and dissociation processes. The study of fluorescence specifically probes electronically excited species resulting from the above-mentioned decay channels and provides information for understanding the competition among these channels.

• Research Organization: Lawrence Berkeley Lab., CA (United States)
• OSTI ID: 603604
• Report Number(s): LBNL--39981; ON: DE97007345; CNN: Grant ATM-9322384; Grant NAGW-1924
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CARBON DIOXIDE
ELECTRONIC STRUCTURE
EXCITATION
EXCITED STATES
FLUORESCENCE
NITROGEN