Absorption oscillator strengths for the a′ 1Σ−u–X 1Σ+g and w 1Δu–X 1Σ+g transitions of molecular nitrogen
Authors:
- 15 April 1976
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 64 (8) , 3370-3374
Abstract
Measurements have been made of the intensities of absorption bands of molecular nitrogen in the vacuum ultraviolet (vuv) in order to determine the lifetimes of the metastable singlet species a′ 1Σ−u and w 1Δu. The method consists of comparing line and band areas among neighboring features. Interest in these states has recently been heightened by recognition of the energy storing capability of their lowest levels and, in particular, of their role as possible precursors in the formation of NO produced by auroral activity. It is found that the v=0 level of the nitrogen a′ 1Σ−u has a lifetime of 0.013 sec. This is governed by transitions to the ground state. The w 1Δu state, on the other hand, should essentially be radiatively disconnected from the ground state at auroral altitudes due to the lack of collisions. There is no evidence for the w–X transitions at low pressures.Keywords
This publication has 16 references indexed in Scilit:
- Transition probabilities for the W^3Δu–B^3Πg system of molecular nitrogenJournal of the Optical Society of America, 1973
- The W3Δustate of molecular nitrogenJournal of Physics B: Atomic and Molecular Physics, 1971
- Evidence for theTransition inPhysical Review B, 1968
- Measurements on theTransition in Molecular NitrogenPhysical Review B, 1966
- Franck-Condon Factors for Observed Transitions in N_{2} above 6 EVThe Astrophysical Journal, 1966
- Observation of aTransition in theMoleculePhysical Review B, 1965
- Potential Curves for the Observed States of N_{2} Below 11 eV.The Astrophysical Journal, 1965
- The High-Resolution Absorption Spectrum of Nitrogen from 1060 TO 1520 Å. II. The α'^{1}Σ_{u} <- Χ^{1}Σ_{g}^{+} System.The Astrophysical Journal, 1965
- The High-Resolution Absorption Spectrum of Nitrogen from 1060 TO 1520 Å. I. The α^{1}Π_{g} <- Χ^{1}Σ_{g}^{+} System.The Astrophysical Journal, 1965
- Far-Ultraviolet Auroral SpectraJournal of the Optical Society of America, 1962