EUV resonance fluorescence of the c 0 4 - X ( 0 , v 00 ) and b 0 - X ( 1 , v 00 ) transitions of N 2
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چکیده
Extreme ultraviolet (EUV) resonance fluorescence of the (0,v00) bands of the c4 Su -X Sg + and the (1,v00) bands of the b0 Su -X Sg + transitions of N2 has been observed by photon excitation of N2 in the vicinity of 95.8 nm. The integrated fluorescence intensities of the c4-X (0,v 00) emission become saturated at N2 pressures higher than 0.16mTorr. The emission features in the spectral region between 105 and 130 nm become progressively significant as the N2 pressure is increased. The (1,v 00) progression for v00 up to 11 of the b0-X transition and two progressions of the Lyman–Birge–Hopfield (LBH) system have been identified. The multiple scattering processes apparently cause significant reduction in the c4-X (0,0) emission rates. The present results may be useful in the explanation of the weak c4-X (0,0) fluorescence as well as the significant c 0 4-X (0,v 00) features in the dayglow of the Earth observed by the Far Ultraviolet Spectroscopic Explorer. r 2008 Elsevier Ltd. All rights reserved.
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تاریخ انتشار 2008