Oscillator strengths and line widths of dipole-allowed transitions in N214 between 89.7 and 93.5 nm

Line oscillator strengths in the 20 electric dipole-allowed bands of N214 in the 89.7-93.5 nm (111480-106950 cm-1) region are reported from photoabsorption measurements at an instrumental resolution of ∼6 mÅ (0.7 cm-1) full width at half maximum. The absorption spectrum comprises transitions to vibrational levels of the 3p u c4′ u+1, 3p π u c3 Πu1, and 3s g o3 Πu1 Rydberg states and of the b′ u+1 and b Πu1 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 J′ =0 in order to facilitate comparisons with results of coupled Schrödinger-equation calculations. Most 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, which are reported for 11 bands, also exhibit strong J dependences. The f value and line width patterns can inform current efforts to develop comprehensive spectroscopic models that incorporate rotational effects and predissociation mechanisms, and they are critical for the construction of realistic atmospheric radiative-transfer models.