Accession Number:

AD0655378

Title:

KINETIC AND SPECTROSCOPIC CONSTRAINTS ON THE ORIGIN OF THE N2 AFTERGLOW,

Descriptive Note:

Corporate Author:

AEROSPACE CORP EL SEGUNDO CALIF LABS DIV

Personal Author(s):

Report Date:

1967-04-01

Pagination or Media Count:

15.0

Abstract:

The large transition probability 110 to 1100 for curve crossing such as occurs in N2 predissociation N2 3B N2 5-Sigma guarantees that the rotationally hot members of the 12th vibrational level of the B state 3B12 will always be in equilibrium with free N atoms without the intervention of a third body. A kinetic scheme is suggested for these species that includes rotational and vibrational quenching in competition with electronic quenching. Fast rotational quenching gives rise to pseudo-equilibrium population of normal 3B12 species. The equilibrium constant for 2N N2 3B12 KB is estimated at 10 to the -1.8th power litermole 10 to the -22.6 power ccparticle at 300K with a negative activation energy of -2.2 kcalmole, in good accord with recent data. Using 100000sec as the measured radiative lifetime of the 12-8 transition yields an absolute emission intensity for this band of 10 to the 3.2 power litermole-sec 10 to the -17.6 power ccmolecule-sec, again in good accord with observation. It appears from this that the 11th, 10th, and 9th vibrational levels are populated by successive collisional deactivation of the 12th level. This collisional deactivation is in competition with electronic quenching. Author

Subject Categories:

  • Atmospheric Physics
  • Radiation and Nuclear Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE