Limits...
Vibrational Branching Ratios and Asymmetry Parameters in the Photoionization of CO 2 in the Region Between 650 Å and 840 Å

View Article: PubMed Central - PubMed

ABSTRACT

The vibrational branching ratios and asymmetry parameters for CO2 have been determined in the wavelength region of 650 Å to near the ionization onset at about 840 Å. The study was performed using synchrotron radiation from the Daresbury storage ring that was dispersed with a 5 m grating monochomator that afforded resolution of 0.1 Å to 0.2 Å. This resolution allowed the study of the branching ratios and asymmetry parameters with enough detail to see the changes in the parameters within the pronounced autoionization structure in CO2 in this wavelength region. While the electron spectrometer resolution was not sufficient to resolve the spin orbit and Renner-Teller splitting in the photoelectron spectra, we are able to fit the data with a model that identifies the major structure in terms of the symmetric stretch and elements of the asymmetric stretch and bending modes. A calculation of the expected relative vibrational excitations based upon the Franck-Condon principle clearly showed non-Franck-Condon behavior in some of the vibrational-electronic transitions.

No MeSH data available.


Plots of the branching ratio for the (610) and branching ratio and asymmetry parameter for the (710) levels of the  ground state.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4862820&req=5

f11-j65par: Plots of the branching ratio for the (610) and branching ratio and asymmetry parameter for the (710) levels of the ground state.

Mentions: In Figs. 6–20, the spectra for β and branching ratio are shown, for all the vibrational levels for which there was significant intensity. These have been selected from the complete data set because they show structure identifiable with the resonance positions; the complete data set is available from a NIST database as described below.


Vibrational Branching Ratios and Asymmetry Parameters in the Photoionization of CO 2 in the Region Between 650 Å and 840 Å
Plots of the branching ratio for the (610) and branching ratio and asymmetry parameter for the (710) levels of the  ground state.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4862820&req=5

f11-j65par: Plots of the branching ratio for the (610) and branching ratio and asymmetry parameter for the (710) levels of the ground state.
Mentions: In Figs. 6–20, the spectra for β and branching ratio are shown, for all the vibrational levels for which there was significant intensity. These have been selected from the complete data set because they show structure identifiable with the resonance positions; the complete data set is available from a NIST database as described below.

View Article: PubMed Central - PubMed

ABSTRACT

The vibrational branching ratios and asymmetry parameters for CO2 have been determined in the wavelength region of 650 Å to near the ionization onset at about 840 Å. The study was performed using synchrotron radiation from the Daresbury storage ring that was dispersed with a 5 m grating monochomator that afforded resolution of 0.1 Å to 0.2 Å. This resolution allowed the study of the branching ratios and asymmetry parameters with enough detail to see the changes in the parameters within the pronounced autoionization structure in CO2 in this wavelength region. While the electron spectrometer resolution was not sufficient to resolve the spin orbit and Renner-Teller splitting in the photoelectron spectra, we are able to fit the data with a model that identifies the major structure in terms of the symmetric stretch and elements of the asymmetric stretch and bending modes. A calculation of the expected relative vibrational excitations based upon the Franck-Condon principle clearly showed non-Franck-Condon behavior in some of the vibrational-electronic transitions.

No MeSH data available.