Oscillator strength of the C/sub 2/ Swan bands
Absolute emission and absorption measurements of rotational lines and band heads of the 0-0 C/sub 2/ Swan system have been made for carbon vapor inequilibrium with graphite at 2853-3051/sup 0/K. The data were treated for deviation from the linear curve of growth and for partial reversal in experiments with an external light source. At 3000/sup 0/K fN''/sub v0K1J0/ = 1.6 x 10/sup 8/ molecules/cm/sup 3/. The sum over all rotational lines of the 0-0 transition yields fN''/sub v0/ = 6.1 x 10/sup 11/ molecules/cm/sup 3/. The average of nine independent fN determinations from the literature yield fN''/sub v0K1J0/ = 1.9 x 10/sup 8/ molecules/cm/sup 3/. These values averaged with lifetime measurements yield f/sub 0,0/ = 0.027 corresponding to a radiative lifetime or the v' = 0 level of 110 ns. The values are consistent with ..delta..H/sub 0//sup 0//R = 101,000 K for the sublimation of C/sub 2/ (a/sup 3/II) from graphite. These values for the Swan system are compared with the corresponding values from the literature for six other band systems of C/sub 2/. 69 references, 1 figure, 5 tables.
- Research Organization:
- Univ. of California, Berkeley
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5208624
- Journal Information:
- High Temp. Sci.; (United States), Journal Name: High Temp. Sci.; (United States) Vol. 11:4; ISSN HITSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION SPECTRA
CARBON
DATA
DIAGRAMS
DIMERS
DISSOCIATION ENERGY
ELEMENTS
EMISSION SPECTRA
ENERGY
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
ENTHALPY
EXCITED STATES
EXPERIMENTAL DATA
INFORMATION
LIFETIME
NONMETALS
NUMERICAL DATA
OPTICAL DEPTH CURVE
OSCILLATOR STRENGTHS
PHYSICAL PROPERTIES
PROBABILITY
ROTATIONAL STATES
SPECTRA
SPECTROSCOPIC CURVE OF GROWTH
SUBLIMATION HEAT
THERMODYNAMIC PROPERTIES
TRANSITION HEAT
VERY HIGH TEMPERATURE