Collisional deactivation of selectively excited N/sup +//sub 2/

Journal Article · Thu May 15 04:00:00 EDT 1980 · J. Chem. Phys.; (United States)

OSTI ID:5460027

Katayama, D H; Miller, T A; Bondybey, V E

Individual vibrational levels of the A /sup 2/Pi/sub u/ state of the N/sup +//sub 2/ molecular ion are excited by a tunable dye laser. Detection of an optical--optical double resonance fluorescence signal produced by a second laser demonstrates that the ions originally pumped into the A /sup 2/Pi/sub u/ state are rapidly deactivated by collisions with He into high vibrational levels of the ground X /sup 2/..sigma../sup +//sub g/ state. Time and wavelength resolved studies show clearly that the population of a given high vibrational level of the X /sup 2/..sigma../sup +//sub g/ state returns into lower A /sup 2/Pi/sub u/ state levels giving rise, effectively, to vibrational relaxation within the A state. Rate constants and cross sections are derived for these collisional, internal-conversion processes. In homonuclear N/sup +//sub 2/, where 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.

• Research Organization: Bell Laboratories, Murray Hill, New Jersey 07974
• OSTI ID: 5460027
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 72:10; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
CHARGED PARTICLES
COLLISIONS
CRYOGENIC FLUIDS
DE-EXCITATION
ELEMENTS
ENERGY LEVELS
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FLUIDS
FLUORESCENCE
HELIUM
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
LUMINESCENCE
MOLECULAR IONS
NITROGEN IONS
NONMETALS
RARE GASES
VIBRATIONAL STATES