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Photoionization of CO2 - Figure Captions

Figure numbers or vibrational levels link to images.

Figure 1: Cross section view of the electron spectrometer chamber. The chamber is 76 cm in diameter and is 91.4 cm in length. The major aspects of the instrument are labeled in the figure.

Figure 2: Photoionization efficiency spectrum for CO2 in the wavelength region from ionization onset to 600 Å. The data were taken using a photoionization mass spectrometer system with a wavelength resolution of 0.12 Å.

Figure 3: Two photoelectron spectra taken on the 0° analyzer at nearby wavelengths. The spectrum differ considerably but the same model fits both relatively well. The solid line is the fit and the dots are the actual data. The vertical columns represent the intensities of the various vibrational transitions as defined in the figure that contribute to the intensity at that point.

Figure 4: Total electron count measured with the electron spectrometer system plotted as a function of wavelength in Å. The main autoionizing Rydberg levels are identified as described in the text.

Figure 5: Three dimensional plot of the results of the fitting routine for all the spectra measured. The molecular energy axis represents the vibrational excitation of the ionic ground state of CO2+. The plot dramatically shows the increased vibrational excitation caused by autoionization phenomena.

Figure 6: Plots of the asymmetry parameter and branching ratio for the (000) and (100) levels of the CO2+ ground state.

Figure 7: Plots of the asymmetry parameter and branching ratio for the (200) and (300) levels of the CO2+ ground state.

Figure 8: Plots of the branching ratio for the (400), (500), (600), and (700) levels of the CO2+ ground state.

Figure 9: Plots of the asymmetry parameter and branching ratio for the (010) and (110) levels of the CO2+ ground state.

Figure 10: Plots of the branching ratio for the (210), (310), (410), and (510) levels of the CO2+ ground state.

Figure 11: Plots of the branching ratio for the (610) and branching ratio and asymmetry parameter for the (710) levels of the CO2+ ground state.

Figure 12: Plots of the branching ratio and asymmetry parameter for the (020) level and branching ratio for the (120) and (220) levels of the CO2+ ground state.

Figure 13: Plots of the branching ratio for the (320), (420), and (520) levels of the CO2+ ground state.

Figure 14: Plots of the branching ratio for the (620) and (720) levels of the CO2+ ground state.

Figure 15: Plots of the branching ratio for the (001), (101), and (201) levels of the CO2+ ground state.

Figure 16: Plots of the branching ratio for the (301), (401), and (501) levels of the CO2+ ground state.

Figure 17: Plots of the branching ratio for the (211), (311), (411), and (511) levels of the CO2+ ground state.

Figure 18: Plots of the asymmetry parameter and branching ratio for the (312) and (412) levels of the CO2+ ground state.

Figure 19: Plots of the asymmetry parameter and branching ratio for the (512) and (612) levels of the CO2+ ground state.

Figure 20: Plots of the asymmetry parameter and branching ratio for the (712) level of the CO2+ ground state.

Figure 21: Histogram of the measured Franck-Condon factors for the CO2+ ground state at positions in the absorption spectrum where Rydberg autoionizing resonance levels exist. The resonances are labeled as in the text.

Figure 22: Histogram of the calculated Franck-Condon factors for the CO2+ ground state at positions in the absorption spectrum where Rydberg autoionizing resonance levels exist. The calculation could not distinguish between the various members of a particular series and hence the same distribution is attributed irrespective of principal quantum number. The resonances calculated are for the Tanaka-Ogawa series with vibrational levels of 0,1,2,3 quanta of the symmetric stretch in the ground electronic state of CO2+.

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Created August 25, 2009, Updated November 15, 2019