Kinetic studies of Ar--N/sub 2/--SF/sub 6/ mixtures following proton excitation

Journal Article · Mon Nov 15 04:00:00 EST 1976 · J. Chem. Phys.; (United States)

OSTI ID:7335737

Chen, C H; Payne, M G; Hurst, G S; Judish, J P

Time resolved studies hexclamationve b%en made of both the vacuum ultraviolet (vuv) and the uv-visible radiation due to pulsed proton excitation of Ar--N/sub 2/, Ar--SF/sub 6/, and Ar--N/sub 2/--SF/sub 6/ mixtures. Photon emissions from Ar and from N/sub 2/ (due to energy transfer from Ar) were both studied, using time resolved spectroscopic techniques. In the Ar--N/sub 2/ mixtures the decay of N/sub 2/(C /sup 3/Pi/sub u/..-->..B /sup 3/Pi/sub g/) is much slower than the natural lifetime of N/sub 2/(C /sup 3/Pi/sub u/). In the case of the (0--1) band for the transition N/sub 2/(C /sup 3/Pi/sub u/..-->..B /sup 3/Pi/sub g/), the decay follows Ar(/sup 3/P/sub 2/); while the decay of the (3--1) band follows that of Ar(/sup 1/P/sub 1/). Decay rates of (1--0) and (2--1) are between the decay of Ar(/sup 1/P/sub 1/) and Ar(/sup 3/P/sub 2/). From least squares fitting, it was found that 68% of v'=2 of N/sub 2/(C /sup 3/Pi/sub u/) comes from Ar(/sup 1/P/sub 1/) and 32% from Ar(/sup 3/P/sub 2/); while 86% of v'=1 comes from Ar(/sup 3/P/sub 2/) and 14% from Ar(/sup 1/P/sub 1/). Since the energy precursor of N/sub 2/(C /sup 3/Pi/sub u/)/sub v//sub prime//sub 3/ is Ar(/sup 1/P/sub 1/), it is clear that the Wigner spin conservation rule does not hold rigorously in this energy transfer process. Quenching rates of Ar(/sup 1/P/sub 1/), Ar(/sup 3/P/sub 2/), Ar(/sup 3/P/sub 1/) and Ar/sub 2/(1/sub u/) by SF/sub 6/ have also been determined. Gas laser applications are discussed briefly. (AIP)

• Research Organization: Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830
• OSTI ID: 7335737
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 65:10; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ARGON
BARYONS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMISTRY
CRYOGENIC FLUIDS
ELEMENTARY PARTICLES
ELEMENTS
EMISSION SPECTRA
ENERGY-LEVEL TRANSITIONS
EXCITATION
FERMIONS
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
HADRONS
HALIDES
HALOGEN COMPOUNDS
KINETICS
NITROGEN
NONMETALS
NUCLEONS
PROTONS
RADIATION CHEMISTRY
RADIATION EFFECTS
RARE GASES
REACTION KINETICS
SPECTRA
SULFUR COMPOUNDS
SULFUR FLUORIDES