Fluorescence Excitation Function Produced Through Photoexcitation of the Rydberg States b, cn, and o3 of N2 in the 80-100 nm Region

Details Fluorescence Excitation Function Produced Through Photoexcitation of the Rydberg States b, cn, and o3 of N2 in the 80-100 nm Region Fluorescence Excitation Function Produced Through Photoexcitation of the Rydberg States b, cn, and o3 of N2 in the 80-100 nm Region

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa21a0230w&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SA21A-0230

Physics

0300 Atmospheric Composition And Structure, 0310 Airglow And Aurora, 0317 Chemical Kinetic And Photochemical Properties, 0343 Planetary Atmospheres (5210, 5405, 5704), 0350 Pressure, Density, And Temperature

Scientific paper

Fluorescence excitation functions produced through photoexcitation of N2 using synchrotron radiation in the spectral region between 80 and 100 nm have been studied. Two broadband detectors were employed to simultaneously monitor fluorescence in the 115-320 nm and 300-700 nm region, respectively. The peaks in the VUV Fluorescence excitation functions are found to correspond to excitation of absorption transitions from the ground electronic state to the Rydberg states of b, cn (with n= 4-9), and o3 of N2. The relative fluorescence production cross sections for the observed peaks are determined. No fluorescence has been produced through excitation of the most dominating absorption features of the b-X transition except the (1,0), (5,0), and (6,0) bands, in excellent agreement with the recent lifetime measurements [1] and theoretical calculations [2]. In addition, fluorescence peaks correlate with the long vibrational progression of the c4 (v = 0-7) has also been observed. Weak fluorescence excitation peaks are also found to correlate with the excitation of the (1,0), (2,0), and (3,0) bands of the o3 VX transition. The present results provide important information for further unraveling of complicated and intriguing interactions among the excited electronic states of N2. Furthermore, solar photon excitation of N2 leading to the production of c4(0) may provide useful data required for evaluation and analysis of dayglow models of the c4(0) issue of the Earth's atmosphere [3]. Detailed results will be presented. This research is based on work supported by NSF grant ATM-0096761. [1] Sprengers, J. P., W. Ubachs, and K. G. H. Baldwin, J. Chem. Phys., 122, 144301 (2005). [2] Lewis, B. R., S. T. Gibson, W. Zhang, H. Lefebvre-Brion, and J.-M. Robbe, J. Chem. Phys., 122, 144302 (2005). [3] e.g., Meier, R. R., Space Sci. Rev., 58, 1 (1991).

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