Rotationally inelastic collisions of a molecule in a sup 1. Delta. electronic state: NH( a sup 1. Delta. )

Journal Article · Wed Nov 01 04:00:00 EST 1989 · Journal of Chemical Physics; (USA)

DOI:https://doi.org/10.1063/1.457579· OSTI ID:5287449

Sauder, D G; Patel-Misra, D; Dagdigian, P J ^[1]

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1. Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218 (US)

The general theory for inelastic scattering of molecules {sup 1}{Delta} electronic states is outlined and applied to the specific case of {sup 1}{Delta} states arising from a {pi}{sup 2} electron occupancy, e.g., NH({ital a} {sup 1}{Delta}). Integral cross sections for rotational transitions out of the lowest rotational level ({ital J}=2) of NH({ital a} {sup 1}{Delta}) {ital v}=0 are reported for several targets. A pulsed beam of rotationally cold NH({ital a} {sup 1}{Delta}) was produced by 193 nm photolysis of a dilute mixture of hydrazoic acid in nitrogen seed gas at the tip of a nozzle. The target beam was also prepared as a pulsed supersonic beam. The final rotational state distribution was measured in the collision zone by laser fluorescence excitation. The state-to-state cross sections were found to decrease significantly with increasing final rotational quantum number {ital J}{prime}. The magnitude of the {ital J}=2{r arrow}{ital J}{prime}=3 cross sections were compared for the different targets. Isotopic scrambling in NH({ital a} {sup 1}{Delta})--D{sub 2} collisions was also searched for but not observed.

• OSTI ID: 5287449
• Journal Information: Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Vol. 91:9; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
BEAMS
CHEMICAL REACTIONS
COLLISIONS
CROSS SECTIONS
DECOMPOSITION
DEUTERIUM
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FLUID FLOW
HYDRAZOIC ACID
HYDRIDES
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
INORGANIC ACIDS
INTEGRAL CROSS SECTIONS
ISOTOPES
LIGHT NUCLEI
MOLECULAR BEAMS
MOLECULE COLLISIONS
MOLECULE-MOLECULE COLLISIONS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
NOZZLES
NUCLEI
ODD-ODD NUCLEI
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADICALS
ROTATIONAL STATES
STABLE ISOTOPES
SUPERSONIC FLOW