Dissociative excitation of nitrogen molecules via low energy electron impact with an application of laser induces fluorescence in the electron excitation of the metastable states of helium

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1988

OSTI ID:5012203

Rall, D L.A.

Absolute optical emission cross sections have been measured for transitions of the N atom and N{sup +} ion produced by electron-impact dissociation of the N{sub 2} molecule in the wavelength range 3800-7000 {angstrom}. The incident electron energy ranges from below threshold to 450 eV. An analysis of the excitation as a function of electron energy leads to an understanding of the different processes which create the observed levels. A novel laser induced fluorescence technique was applied to the triplet metastable state of helium. A direct cross section for electron-impact excitation from the 2{sup 3}S level to the 3{sup 3}P level was measured. Relative apparent cross sections for excitation to other helium levels are also presented.

• Research Organization: Wisconsin Univ., Madison, WI (USA)
• OSTI ID: 5012203
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOMS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DISSOCIATION
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
FLUIDS
FLUORESCENCE
GASES
HELIUM
IONS
LASERS
LUMINESCENCE
METASTABLE STATES
MOLECULE COLLISIONS
NITROGEN
NONMETALS
RARE GASES