# LASER INDUCED FLUORESCENCE FROM THE $A^{2}\pi_{u}$ STATE OF $N_{2}^{+}$

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 Title: LASER INDUCED FLUORESCENCE FROM THE $A^{2}\pi_{u}$ STATE OF $N_{2}^{+}$ Creators: Katayama, D. H.; Miller, Terry A.; Bondybey, V. E. Issue Date: 1980 Publisher: Ohio State University Abstract: A tunable pulsed dye laser has been used to selectively excite vibrational levels of the A$^{2}\pi_{u}$ state of $N_{2}^{+}$. The collisional deactivation processes for these levels have been deduced from their laser induced fluorescence. An optical-optical double resonance experiment using a second laser confirms that the ions originally pumped into the $A^{2}\pi_{u}$ state are rapidly deactivated by collisions with He into high vibrational levels of the ground X$^{2}\pi_{g}^{+}$ state. Time resolved studies show that the population of a given high vibrational level of the $X^{2}\Sigma ^{+}_{g}$ state returns into lower A$^{2}\pi_{u}$ state levels giving rise to vibrational relaxation within the A state. In homonuclear $N_{2}^{+}$, where g--u symmetry considerations prohibit X and A state perturbations, these processes proceed as rapidly as in heteronuclear species where perturbations are known to be present in the free molecule. Description: Author Institution: URI: http://hdl.handle.net/1811/11421 Other Identifiers: 1980-TG-9