Absolute cross sections for the electron impact ionization of the NF[sub 2] and NF free radicals

Journal Article · Fri Apr 15 04:00:00 EDT 1994 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.467129· OSTI ID:6931886

Tarnovsky, V; Levin, A; Becker, K ^[1]

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1. Department of Physics, City College of The City University of New York, New York, New York 10031 (United States)

We report measurements of the absolute cross sections for the electron-impact ionization of the NF[sub 2] and NF free radicals from threshold to 200 eV. At 70 eV, the absolute parent NF[sub 2] and NF ionization cross section are 1.25[plus minus]0.23 A[sup 2] and 1.05[plus minus]0.19 A[sup 2], respectively. We found little evidence of the presence of vibrationally excited radicals in the incident target beam for both NF[sub 2] and NF. We also studied the dissociative ionization of NF[sub 2] and NF. The absolute cross section for the formation of the NF[sup +] fragment ions from NF[sub 2] was found to be 0.75[plus minus]0.15 A[sup 2] at 70 eV. The NF[sup +] fragment ions are formed with little excess kinetic energy. The only significant pathway leading to the observed NF[sup +] fragment ions is the single positive ion formation. Our data show no indication of the presence of double positive ion formation channels or positive--negative ion pair formation processes. Cross sections for the formation of the atomic fragment ions F[sup +] and N[sup +] from both NF[sub 2] as well as NF were found to be small with maximum values of less than 0.1 A[sup 2] at 70 eV in all cases.

• OSTI ID: 6931886
• Journal Information: Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 100:8; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
CATIONS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DISSOCIATION
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ENERGY
FLUORIDES
FLUORINE COMPOUNDS
FLUORINE IONS
HALIDES
HALOGEN COMPOUNDS
IONIZATION
IONS
MOLECULE COLLISIONS
NITROGEN COMPOUNDS
NITROGEN FLUORIDES
NITROGEN IONS
RADICALS
THRESHOLD ENERGY
YIELDS