Line oscillator strength measurements in the 0-0 band of the c'4 - X transition of N_2

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Scientific paper

Oscillator strengths for 48 rotational lines in the 0-0 band of the c'4 - X system of N_2, a prominent feature in planetary airglow emissions, were determined from VUV photoabsorption spectra recorded with an instrumental resolution of 6.5 x 10-4 nm. Our results are compared with earlier measurements of band-integrated absorption cross sections and with a study of electron-impact-induced emission from c'_4(0), as well as with electron scattering measurements and a nonadiabatic calculation of vibronic band strengths. Relative P- and R-branch absorption intensities deviate systematically from those of an unperturbed ^1Σ - ^1Σ band, as expected from the interactions of the c'4 (v = 0) level with nearby Rydberg and valence states. In addition, band f-values derived from pairs of R- and P-branch transitions with a common lower-state rotational level, f(J"), are found to be J-dependent. This J-dependence is discussed in the context of the interference patterns which characterize the absorption strengths in the region of the wide-spread interactions between Rydberg and valence state levels.

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