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

Journal Article · Wed Nov 01 00:00:00 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), Vol. 91:9; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

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