Observation of CN [ital A][r arrow][ital X] and [ital B][r arrow][ital X] emissions in gas-phase collisions of fast O([sup 3][ital P]) atoms with HCN

Journal Article · Thu Jul 01 04:00:00 EDT 1993 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.48.427· OSTI ID:6429862

Orient, O J; Chutjian, A; Martus, K E ^[1]; Murad, E ^[2]

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1. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109 (United States)
2. Phillips Laboratory/WSSI, Hanscom Air Force Base, Bedford, Massachusetts 01731 (United States)

Optical emissions in single-collision reactions of fast (5--25-eV translational energy) O([sup 3][ital P]) atoms with HCN have been measured in a crossed-beam geometry. The emissions were observed in the wavelength range 345--430 and 550--825 nm, and were identified as the CN([ital B] [sup 2][Sigma][sup +][r arrow][ital X] [sup 2][Sigma][sup +]) and CN([ital A] [sup 2][Pi][sub [ital i]][r arrow][ital X] [sup 2][Sigma][sup +]) transitions, respectively. The experimental [ital B][r arrow][ital X] vibrational bands were found to fit a synthetic spectrum of CN at a vibrational temperature of 7000 K (0.60 eV) and a rotational temperature of 2000 K (0.17 eV). The [ital A][r arrow][ital X] spectra were simulated in terms of known Franck-Condon factors for that band system. The energy threshold for the CN([ital B][r arrow][ital X]) emission was measured to be 7.4[plus minus]0.8 eV (lab) or 4.6[plus minus]0.5 eV (c.m.), which agrees with the energy threshold for the reaction O([sup 3][ital P])+HCN([ital [tilde X]])[r arrow]OH([ital X])+CN([ital B]).

• OSTI ID: 6429862
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 48:1; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
COLLISIONS
CYANIDES
CYANOGEN
DECAY
ELEMENTS
EMISSION SPECTRA
ENERGY LEVELS
ENERGY RANGE
EV RANGE
EXCITED STATES
HYDROCYANIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
KINETICS
MOLECULE COLLISIONS
NONMETALS
OXYGEN
PARTICLE DECAY
RADIATIVE DECAY
REACTION KINETICS
SPECTRA
VIBRATIONAL STATES