Measurement of the differential cross section for the electron impact excitation of the neon 1s/sup 2/2s/sup 2/2p/sup 5/3s metastable states
Thesis/Dissertation
·
OSTI ID:6901094
This thesis is a report of a measurement of the differential cross section of the electron impact excitation of the 1s/sup 2/2s/sup 2/2p/sup 5/3s metastable states of neon. The results are obtained for incident electron energies 0.1-1.0 EV above the 16.6 EV threshold for these states. Electron excitation of the neon atoms is achieved by colliding an electron beam with an atomic neon beam. Both beams are well collimated and collide at 90 degrees. The electron beam is produced by an inline retarding potential type electron gun with an energy width of 0.6 ev full width at half maximum. The data are acquired using a time of flight technique that uses a metastable detector to measure the time of flight of the scattered, long lived J = 0 and J = 2 metastable excited states of neon. Preliminary to extracting the differential cross section, the electron beam energy distribution and neon ground state velocity distribution are measured. The electron beam energy distribution is found to be maxwellian with a characteristic temperature T = 1950 K and a 0.5 v smear, due to the potential drop across the filament producing the electrons. The results obtained for the differential cross section support the existence of a negative ion shape resonance, classified as 1s/sup 2/2s/sup 2/2p/sup 5/3s 3p. This resonance is observed as an onset of S + P wave scattering at an incident electron energy of 17.2 EV.
- Research Organization:
- Michigan Univ., Ann Arbor (USA)
- OSTI ID:
- 6901094
- Country of Publication:
- United States
- Language:
- English
Similar Records
Electron excitation cross sections for the metastable and resonant levels of Ne(2p/sup 5/3s)
Electron excitation cross sections of the 2p/sup 5/3s levels of neon
Electron impact excitation of fine-structure levels of neon-like titanium (Ti XIII)
Journal Article
·
Tue Oct 01 00:00:00 EDT 1985
· Phys. Rev. A; (United States)
·
OSTI ID:5264551
Electron excitation cross sections of the 2p/sup 5/3s levels of neon
Thesis/Dissertation
·
Thu Dec 31 23:00:00 EST 1981
·
OSTI ID:5004467
Electron impact excitation of fine-structure levels of neon-like titanium (Ti XIII)
Journal Article
·
Thu Dec 31 23:00:00 EST 1998
· Atomic Data and Nuclear Data Tables
·
OSTI ID:345184
Related Subjects
640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
BEAMS
COLLIDING BEAMS
COLLISIONS
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELEMENTS
ENERGY LEVELS
ENERGY RANGE
ENERGY SPECTRA
ENERGY-LEVEL TRANSITIONS
EV RANGE
EV RANGE 10-100
EXCITATION
EXCITED STATES
EXPERIMENTAL DATA
FLUIDS
GASES
INFORMATION
METASTABLE STATES
NEON
NONMETALS
NUMERICAL DATA
RARE GASES
SPECTRA
TIME-OF-FLIGHT METHOD
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
BEAMS
COLLIDING BEAMS
COLLISIONS
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELEMENTS
ENERGY LEVELS
ENERGY RANGE
ENERGY SPECTRA
ENERGY-LEVEL TRANSITIONS
EV RANGE
EV RANGE 10-100
EXCITATION
EXCITED STATES
EXPERIMENTAL DATA
FLUIDS
GASES
INFORMATION
METASTABLE STATES
NEON
NONMETALS
NUMERICAL DATA
RARE GASES
SPECTRA
TIME-OF-FLIGHT METHOD