Cascade production of Ar(3p/sup 5/4p) following electron bombardment

Journal Article · Mon Jun 01 00:00:00 EDT 1981 · J. Chem. Phys.; (United States)

OSTI ID:6405953

Keto, J W; Kuo, C

We observe the time dependence of the fluorescence of Ar(3p/sup 5/4p) following electron excitation of argon at pressures from 2--3000 Torr. The population of these levels at the lowest pressures observed is dominated by radiative cascade from Ar(3p/sup 5/3d) and Ar(3p/sup 5/5s). For argon states 4p'(1/2)/sub 0/, 4p'(3/2)/sub 2/, and 4p(1/2)/sub 0/ we find the cascade transitions can be identified and we assign radiative lifetimes of 61 +- 10, 69 +- 12, and 61 +- 6 nsec to 3d'(3/2)/sub 1/, 3d'(5/2)/sub 3/, and 3d(3/2)/sub 1/, respectively. For cascade lifetimes to other levels, unique assignments cannot be made until values for forbidden electron impact cross sections to 3p/sup 5/3d and 3p/sup 5/5s can be obtained. The collisional quenching rates for the cascading levels are measured and found to explain the pressure dependence of the decay of Ar(3p/sup 5/4p) over the full range of pressure except for Ar(3p/sup 5/4p'(1/2)/sub 1/) which has a unique and interesting behavior at high pressures.

• Research Organization: Physics Department and Electronics Research Center, The University of Texas, Austin, Texas 78712
• OSTI ID: 6405953
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 74:11; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ARGON
ATOM COLLISIONS
COLLISIONS
DATA
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELEMENTS
EMISSION SPECTRA
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
EXPERIMENTAL DATA
FLUIDS
FLUORESCENCE
GASES
INFORMATION
LIFETIME
LOW PRESSURE
LUMINESCENCE
MEDIUM PRESSURE
NONMETALS
NUMERICAL DATA
PRESSURE DEPENDENCE
RARE GASES
SPECTRA
TIME DEPENDENCE