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Cross sections for 3064 A band emission produced in collisions of 50--250 keV protons with water molecules in water vapor

Journal Article · · J. Chem. Phys.; (United States)
DOI:https://doi.org/10.1063/1.432875· OSTI ID:7350742
;

Emission by excited products of collisions between 50--250 keV protons and H/sub 2/O molecules in water vapor has been studied in the wavelength region 1050--3300 A. The relative single collision cross sections for emission of 3064 A (A /sup 2/..sigma../sup +/--X /sup 2/Pi: O--O) band radiation by excited OH have been measured for proton kinetic energies of 50,150, and 250 keV. Measurements were also made of the relative cross section for emission of 3914 A (B /sup 2/..sigma../sup +//sub u/-X /sup 2/..sigma../sup +//sub g/:O--O) band radiation by excited N/sub 2//sup +/ produced in collisions of 50 keV protons with N/sub 2/. Comparison of the relative OH emission cross sections with that obtained for N/sub 2//sup +/, and normalization of the 3914 A N/sub 2//sup +/ emission data to the absolute value for this cross section obtained by other investigators, yields values of the cross section for 3064 A band emission by OH in H/sup +/+H/sub 2/O collisions of (2.82 +- 1.42) x 10/sup -18/ cm/sup 2/ at 50 keV, (1.79 +- 0.93) x 10/sup -18/ cm/sup 2/ at 150 keV, and (1.69 +- 0.87) x 10/sup -18/ cm/sup 2/ at 250 keV proton projectile energy. (AIP)

Research Organization:
Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37919
OSTI ID:
7350742
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

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Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
CATIONS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
CRYOGENIC FLUIDS
ELEMENTS
EMISSION SPECTRA
ENERGY RANGE
FLUIDS
HYDROGEN COMPOUNDS
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
ION COLLISIONS
ION-MOLECULE COLLISIONS
IONS
KEV RANGE
KEV RANGE 10-100
KEV RANGE 100-1000
MOLECULE COLLISIONS
NITROGEN
NONMETALS
OXYGEN COMPOUNDS
SPECTRA
WATER