A guided-ion beam study of the reactions of Xe{sup +} and Xe{sup 2+} with NH{sub 3} at hyperthermal collision energies

Journal Article · Thu Oct 21 00:00:00 EDT 2010 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.3488055· OSTI ID:21559931

Levandier, Dale J ^[1]; Chiu, Yu-Hui ^[2]

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1. Boston College Institute for Scientific Research, Chestnut Hill, Massachusetts 02159 (United States)
2. Air Force Research Laboratory, Space Vehicles Directorate, Hanscom AFB, Massachusetts 02452 (United States)

We have measured the absolute cross sections for reactions of Xe{sup +} and Xe{sup 2+} with NH{sub 3} at collision energies in the range from near-thermal to {approx}34 and {approx}69 eV, respectively. For Xe{sup +}, the cross section for charge transfer, the only exothermic channel, decreases from {approx}200 A{sup 2} below 0.1 eV to {approx}12 A{sup 2} at the highest energies studied. The production of NH{sub 3}{sup +} is the only channel observed below 5 eV, above which a small amount of NH{sub 2}{sup +} is also formed. In Xe{sup 2+} reactions, the main products observed are NH{sub 3}{sup +} and NH{sub 2}{sup +}. The charge transfer cross section decreases monotonically from {approx}80 to {approx}6 A{sup 2} over the studied energy range. The NH{sub 2}{sup +} cross section is similar to the charge transfer cross section at the lowest energies, and exhibits a second component above 0.4 eV, with a maximum of 65 A{sup 2} at 0.7 eV, above which the cross section decreases to {approx}30 A{sup 2} at the highest energies studied. At energies above 10 eV, a small amount of NH{sup +} is also observed in Xe{sup 2+} collisions. Product recoil velocity distributions were determined at selected collision energies, using guided-ion beam time-of-flight methods.

• OSTI ID: 21559931
• Journal Information: Journal of Chemical Physics, Vol. 133, Issue 15; Other Information: DOI: 10.1063/1.3488055; (c) 2010 American Institute of Physics; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AMIDES
AMMONIA
CHARGE EXCHANGE
CROSS SECTIONS
DISTRIBUTION
EV RANGE
ION BEAMS
ION-MOLECULE COLLISIONS
REACTION KINETICS
RECOILS
RINGS
SPECTRA
TIME-OF-FLIGHT METHOD
XENON
XENON IONS
BEAMS
CHARGED PARTICLES
COLLISIONS
ELEMENTS
ENERGY RANGE
FLUIDS
GASES
HYDRIDES
HYDROGEN COMPOUNDS
ION COLLISIONS
IONS
KINETICS
MOLECULE COLLISIONS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
RARE GASES