Electron-impact excitation of the D /sup 3/. sigma. /sub u//sup +/ and c/sub 4//sup prime/ /sup 1/. sigma. /sub u//sup +/ Rydberg states of N/sub 2/

Journal Article · Sun Apr 01 00:00:00 EST 1984 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.29.1709· OSTI ID:6778884

Filippelli, A R; Chung, S; Lin, C C

Absolute optical-emission excitation functions have been measured for the D /sup 3/..sigma../sub u//sup +/..-->..B /sup 3/Pi/sub g/ fourth positive system bands (0,v'') with v'' = 0,1,2,3,4,5,6 and for the c/sub 4//sup prime/ /sup 1/..sigma../sub u//sup +/..-->..a /sup 1/Pi/sub g/ Gaydon-Herman singlet system bands (0,v'') with v'' = 0,1,2,3,4,5 produced by electron-impact excitation of the N/sub 2/ X /sup 1/..sigma../sub g//sup +/(v = 0) ground state, for incident electron energies ranging from threshold to 440 eV. We find that the D..-->..B emission has a principal maximum at 14.1 +- 0.3 eV, a smaller maximum (83% of principal maximum) at 23 eV, and an E/sup -3/ energy dependence for incident electron energies E>65 eV. Measurements over the energy range 13.5--31 eV indicate the D..-->..B emission is unpolarized. The sum over v'' of the D..-->..B (0,v'') optical-emission cross sections gives a maximum value 1.27 x 10/sup -19/ cm/sup 2/ for the apparent cross section for the v = 0 vibrational level of the D /sup 3/..sigma../sub u//sup +/ state excited by electron collision with the N/sub 2/ X /sup 1/..sigma../sub g//sup +/(v = 0) ground state. The appearance of two maxima in the D..-->..B optical emission is qualitatively confirmed by other experimental work. This point is discussed. For the c/sub 4//sup prime/..-->..a emission we find a single very broad maximum near 80 eV and for E>110 eV an energy dependence described by the form (C/sub 1//E)ln(E/C/sub 2/).

• Research Organization: Department of Physics, University of Wisconsin, Madison, Wisconsin 53706
• OSTI ID: 6778884
• Journal Information: Phys. Rev. A; (United States), Vol. 29:4
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ELECTRON-MOLECULE COLLISIONS
EXCITATION
NITROGEN
BRANCHING RATIO
CROSS SECTIONS
EXPERIMENTAL DATA
POLARIZATION
RYDBERG STATES
COLLISIONS
DATA
ELECTRON COLLISIONS
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
INFORMATION
MOLECULE COLLISIONS
NONMETALS
NUMERICAL DATA
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena