Oscillator strengths and line widths of dipole-allowed transitions in 14N2 between 86.0 and 89.7 nm.

Oscillator strengths of 23 electric-dipole-allowed bands of 14N2 in the 86.0–89.7 nm (111 480–116 280 cm-1) region are reported from synchrotron-based photoabsorption measurements at an instrumental resolution of 6.5×10-4 nm (0.7 cm-1) full width at half maximum. The absorption spectrum comprises transitions to vibrational levels of the cn 1Πu (n=3,4), o3 1Πu, and cn+1′ 1Σu+(n=3,4) Rydberg states as well as the b 1Πu and b′ 1Σu+ valence states. The J dependences of band f-values derived from the experimental line f-values are reported as polynomials in J(J+1) and are extrapolated to zero nuclear rotation in order to facilitate comparisons with the results of coupled Schrödinger equation calculations. Many bands in this study are characterized by a strong J dependence of the band f-values and display anomalous P-, Q-, and R-branch intensity patterns. Predissociation line widths are reported for six bands. The experimental f-value and line-width patterns inform current efforts to develop comprehensive spectroscopic models for N2 that incorporate rotational effects and predissociation mechanisms, and are critical for the construction of realistic atmospheric radiative-transfer models. [ABSTRACT FROM AUTHOR]