Collision energy dependence of the cross sections for the dissociative excitation reactions: Rg(/sup 3/P/sub 0,2/) +NH/sub 3/. -->. Rg+NH(A /sup 3/Pi, c /sup 1/Pi)+H/sub 2/ (Rg = Ar, Kr)

Journal Article · Thu May 01 04:00:00 EDT 1986 · J. Chem. Phys.; (United States)

OSTI ID:5974060

Tabayashi, K; Shobatake, K

The integral cross sections for the title reactions were determined for the relative collision energies between 0.3 and 1.4 eV by applying arc-heating metastable rare gas beams to a crossed molecular beam--time-of-flight (TOF) energy selection technique, in which product fluorescence intensities from both NH(A /sup 3/Pi--X /sup 3/..sigma../sup -/) and NH(c /sup 1/Pi--a /sup 1/..delta..) bands were monitored. With Ar(/sup 3/P/sub 0,2/) excitation, the relative branching fractions of nascent NH(A /sup 3/Pi) and NH(c /sup 1/Pi) formation were found to be invariant with the collision energy within the experimental error. With Kr(/sup 3/P/sub 0,2/) excitation, however, no apparent NH(c /sup 1/Pi--a /sup 1/..delta..) emission was observed, only emission from NH(A /sup 3/Pi) was observed. The absolute cross section for formation of these nascent NH radicals was also determined. Collision energy dependence of the cross section for the reaction Ar (/sup 3/P/sub 0,2/) +NH/sub 3/..-->..Ar(/sup 1/S/sub 0/)+NH(A /sup 3/Pi,c /sup 1/Pi)+H/sub 2/ was found to be negative, whereas that for the reaction Kr(/sup 3/P/sub 0,2/)+NH/sub 3/..-->..Kr(/sup 1/S/sub 0/)+NH(A /sup 3/Pi)+H/sub 2/ showed positive dependence in the collision energy range studied. Possible mechanisms for the formation of NH(A /sup 3/Pi,c /sup 1/Pi) from Rg(/sup 3/P/sub 0,2/)+NH/sub 3/ are discussed.

• Research Organization: Institute for Molecular Science, Okazaki 444, Japan
• OSTI ID: 5974060
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 84:9; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
AMMONIA
ARGON
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
ATOMIC BEAMS
BEAMS
CHEMICAL REACTIONS
COLLISIONS
CROSS SECTIONS
DISSOCIATION
ELEMENTS
EMISSION SPECTRA
ENERGY DEPENDENCE
ENERGY-LEVEL TRANSITIONS
EXCITATION
FLUIDS
GASES
HYDRIDES
HYDROGEN COMPOUNDS
KRYPTON
MOLECULE COLLISIONS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
RARE GASES
SPECTRA